diff --git a/bin/make_vers b/bin/make_vers
index 888520edfb7..e3ee884cbd5 100755
--- a/bin/make_vers
+++ b/bin/make_vers
@@ -433,6 +433,19 @@ sub parse_line ($) {
             $curr_sym_number++;
         }
 
+        # For API versions earlier than the function's introduction,
+        # default to the earliest version (version 1) for maximum compatibility
+        my $intro_vers = $vers_list[0];
+        foreach my $hash_vers (@versions) {
+            if ($hash_vers < $intro_vers) {
+                if ($line_type == 1) {
+                    $api_vers_to_function_vers{$hash_vers}{$name} = 1;
+                } else {
+                    $api_vers_to_type_vers{$hash_vers}{$name} = 1;
+                }
+            }
+        }
+
         # Store the number of symbol versions in a hash table, indexed by the name
         if ($line_type == 1) {
             $functions{$name} = $#vers_list + 1;
@@ -519,6 +532,160 @@ sub create_doxygen_cmake ($) {
     close CMAKE;
 }
 
+##############################################################################
+# Create the generated test file for verifying API version defaulting
+#
+sub create_test ($) {
+    my $prefix = shift;         # Get the prefix for the source file (e.g., "src/")
+    my $file = "tapi_version_default.c";
+
+    # Output to test directory (relative to src/)
+    my $test_dir = $prefix;
+    $test_dir =~ s/src\/?$/test\//;
+
+    # Validate the substitution succeeded
+    if ($test_dir eq $prefix && $prefix ne "") {
+        die "create_test: prefix '$prefix' does not end in 'src/' -- cannot derive test directory";
+    }
+
+    # Create test directory if it doesn't exist
+    if ($test_dir ne "" && ! -d $test_dir) {
+        mkdir $test_dir or die "unable to create directory: $test_dir";
+    }
+
+    # Open new test file
+    open TEST, ">${test_dir}${file}" or die "unable to create test file: ${test_dir}${file}";
+
+    # Print copyright and warning
+    print_copyright(*TEST);
+    print_warning(*TEST);
+
+    # Print test description
+    print TEST "/*\n";
+    print TEST " * Purpose: Tests that versioned API function macros default to the earliest\n";
+    print TEST " *          version for functions introduced after the configured global API\n";
+    print TEST " *          version. For example, with H5_USE_16_API, H5Sencode (introduced\n";
+    print TEST " *          in v1.8) should map to H5Sencode1, not H5Sencode2.\n";
+    print TEST " *\n";
+    print TEST " *          This test is compiled multiple times with different\n";
+    print TEST " *          -DH5_USE_*_API and -DTEST_API_VERSION=* flags to verify each\n";
+    print TEST " *          API version level.\n";
+    print TEST " */\n";
+
+    # Emit preamble that clears all global API version defaults.
+    # When the project is configured with a default API version (e.g.,
+    # HDF5_DEFAULT_API_VERSION=v16), H5pubconf.h defines H5_USE_16_API_DEFAULT,
+    # which causes H5version.h to activate H5_USE_16_API. If the test also
+    # defines -DH5_USE_200_API, both blocks would be active and the earliest
+    # one wins (setting everything to version 1). To isolate each test to
+    # exactly one API version, we include H5pubconf.h first (setting its
+    # include guard), then #undef all API version macros, and re-establish
+    # only the version under test before including the rest of the headers.
+    print TEST "/* Include config header first to set its include guard */\n";
+    print TEST "#include \"H5pubconf.h\"\n\n";
+    print TEST "/* Clear all API version macros that may have been set by the\n";
+    print TEST " * global default configuration, so only the version under test\n";
+    print TEST " * is active when H5version.h is processed.\n";
+    print TEST " */\n";
+    foreach my $api_vers (@versions) {
+        print TEST "#undef H5_USE_${api_vers}_API_DEFAULT\n";
+        print TEST "#undef H5_USE_${api_vers}_API\n";
+    }
+    print TEST "\n";
+    print TEST "/* Re-establish only the API version under test */\n";
+    my $first_preamble = 1;
+    foreach my $api_vers (@versions) {
+        if ($first_preamble) {
+            print TEST "#if TEST_API_VERSION == $api_vers\n";
+            $first_preamble = 0;
+        }
+        else {
+            print TEST "#elif TEST_API_VERSION == $api_vers\n";
+        }
+        print TEST "  #define H5_USE_${api_vers}_API 1\n";
+    }
+    print TEST "#else\n";
+    print TEST "  #error \"TEST_API_VERSION not set to a valid value\"\n";
+    print TEST "#endif\n\n";
+
+    print TEST "#include \"h5test.h\"\n\n";
+
+    # Print CHECK_VERS macro for functions
+    print TEST "/*\n";
+    print TEST " * Helper macro: check that a _vers macro equals an expected value.\n";
+    print TEST " */\n";
+    print TEST "#define CHECK_VERS(func_name, expected)                                  \\\n";
+    print TEST "    do {                                                                 \\\n";
+    print TEST "        if (func_name##_vers != (expected)) {                            \\\n";
+    print TEST "            fprintf(stderr, \"FAIL: %s_vers = %d, expected %d\\n\",      \\\n";
+    print TEST "                    #func_name, func_name##_vers, (expected));            \\\n";
+    print TEST "            nerrors++;                                                    \\\n";
+    print TEST "        }                                                                \\\n";
+    print TEST "    } while (0)\n\n";
+
+    # Print CHECK_VERS_T macro for typedefs
+    print TEST "#define CHECK_VERS_T(type_name, expected)                                \\\n";
+    print TEST "    do {                                                                 \\\n";
+    print TEST "        if (type_name##_t_vers != (expected)) {                          \\\n";
+    print TEST "            fprintf(stderr, \"FAIL: %s_t_vers = %d, expected %d\\n\",    \\\n";
+    print TEST "                    #type_name, type_name##_t_vers, (expected));          \\\n";
+    print TEST "            nerrors++;                                                    \\\n";
+    print TEST "        }                                                                \\\n";
+    print TEST "    } while (0)\n\n";
+
+    # Print main function
+    print TEST "int\n";
+    print TEST "main(void)\n";
+    print TEST "{\n";
+    print TEST "    int nerrors = 0;\n\n";
+    print TEST "    TESTING(\"API version defaulting for versioned functions\");\n\n";
+
+    # Generate test sections for each API version
+    my $first = 1;
+    foreach my $api_vers (@versions) {
+        if ($first) {
+            print TEST "#if TEST_API_VERSION == $api_vers\n";
+            $first = 0;
+        }
+        else {
+            print TEST "#elif TEST_API_VERSION == $api_vers\n";
+        }
+        print TEST "    printf(\"Configured with H5_USE_${api_vers}_API\\n\");\n\n";
+
+        # Print checks for all functions at this API version
+        for my $name (sort keys %{$api_vers_to_function_vers{$api_vers}}) {
+            my $expected = $api_vers_to_function_vers{$api_vers}{$name};
+            print TEST "    CHECK_VERS($name, $expected);\n";
+        }
+        print TEST "\n";
+
+        # Print checks for all typedefs at this API version
+        for my $name (sort keys %{$api_vers_to_type_vers{$api_vers}}) {
+            my $expected = $api_vers_to_type_vers{$api_vers}{$name};
+            print TEST "    CHECK_VERS_T($name, $expected);\n";
+        }
+        print TEST "\n";
+    }
+
+    # Close the #if/#elif chain
+    print TEST "#else\n";
+    print TEST "#error \"TEST_API_VERSION not set to a valid value\"\n";
+    print TEST "#endif\n\n";
+
+    # Print result checking and return
+    print TEST "    if (nerrors) {\n";
+    print TEST "        H5_FAILED();\n";
+    print TEST "        fprintf(stderr, \"    %d version check%s failed\\n\", nerrors, nerrors > 1 ? \"s\" : \"\");\n";
+    print TEST "        return 1;\n";
+    print TEST "    }\n\n";
+    print TEST "    PASSED();\n";
+    print TEST "    return 0;\n";
+    print TEST "}\n";
+
+    # Close test file
+    close TEST;
+}
+
 ##############################################################################
 # Read symbol version file (given as command-line argument) in and process it
 # into internal data structures, then create header files.
@@ -551,5 +718,7 @@ for $file (@ARGV) {
     create_public($prefix);
     print "Generating 'doxygen/H5version_doxygen.cmake'\n";
     create_doxygen_cmake($prefix);
+    print "Generating 'test/tapi_version_default.c'\n";
+    create_test($prefix);
 }
 
diff --git a/release_docs/CHANGELOG.md b/release_docs/CHANGELOG.md
index 13aa32ce1c1..4397a7aba9c 100644
--- a/release_docs/CHANGELOG.md
+++ b/release_docs/CHANGELOG.md
@@ -65,6 +65,10 @@ We would like to thank the many HDF5 community members who contributed to this r
 
 ## Library
 
+### Versioned API functions now default to earliest version for older API settings
+
+   When a global API compatibility version is set (e.g., `H5_USE_16_API`), functions introduced after that version previously defaulted to their latest version, which could break applications. For example, an application using `H5_USE_16_API` that called `H5Sencode()` (introduced in 1.8, versioned in 1.12) would get `H5Sencode2()` instead of `H5Sencode1()`, potentially causing compilation or runtime failures. Versioned functions now default to their earliest (version 1) variant when the configured API level predates the function's introduction, providing maximum compatibility. See issue [#6278](https://github.com/HDFGroup/hdf5/issues/6278).
+
 ## Parallel Library
 
 ## Fortran Library
diff --git a/src/H5version.h b/src/H5version.h
index 92206293022..536f3dbeffd 100644
--- a/src/H5version.h
+++ b/src/H5version.h
@@ -84,6 +84,10 @@
   #define H5Dopen_vers 1
 #endif /* !defined(H5Dopen_vers) */
 
+#if !defined(H5Dread_chunk_vers)
+  #define H5Dread_chunk_vers 1
+#endif /* !defined(H5Dread_chunk_vers) */
+
 #if !defined(H5Eclear_vers)
   #define H5Eclear_vers 1
 #endif /* !defined(H5Eclear_vers) */
@@ -108,6 +112,10 @@
   #define H5Ewalk_vers 1
 #endif /* !defined(H5Ewalk_vers) */
 
+#if !defined(H5Fget_info_vers)
+  #define H5Fget_info_vers 1
+#endif /* !defined(H5Fget_info_vers) */
+
 #if !defined(H5Gcreate_vers)
   #define H5Gcreate_vers 1
 #endif /* !defined(H5Gcreate_vers) */
@@ -116,6 +124,58 @@
   #define H5Gopen_vers 1
 #endif /* !defined(H5Gopen_vers) */
 
+#if !defined(H5Iregister_type_vers)
+  #define H5Iregister_type_vers 1
+#endif /* !defined(H5Iregister_type_vers) */
+
+#if !defined(H5Lget_info_vers)
+  #define H5Lget_info_vers 1
+#endif /* !defined(H5Lget_info_vers) */
+
+#if !defined(H5Lget_info_by_idx_vers)
+  #define H5Lget_info_by_idx_vers 1
+#endif /* !defined(H5Lget_info_by_idx_vers) */
+
+#if !defined(H5Literate_vers)
+  #define H5Literate_vers 1
+#endif /* !defined(H5Literate_vers) */
+
+#if !defined(H5Literate_by_name_vers)
+  #define H5Literate_by_name_vers 1
+#endif /* !defined(H5Literate_by_name_vers) */
+
+#if !defined(H5Lvisit_vers)
+  #define H5Lvisit_vers 1
+#endif /* !defined(H5Lvisit_vers) */
+
+#if !defined(H5Lvisit_by_name_vers)
+  #define H5Lvisit_by_name_vers 1
+#endif /* !defined(H5Lvisit_by_name_vers) */
+
+#if !defined(H5Oget_info_vers)
+  #define H5Oget_info_vers 1
+#endif /* !defined(H5Oget_info_vers) */
+
+#if !defined(H5Oget_info_by_idx_vers)
+  #define H5Oget_info_by_idx_vers 1
+#endif /* !defined(H5Oget_info_by_idx_vers) */
+
+#if !defined(H5Oget_info_by_name_vers)
+  #define H5Oget_info_by_name_vers 1
+#endif /* !defined(H5Oget_info_by_name_vers) */
+
+#if !defined(H5Ovisit_vers)
+  #define H5Ovisit_vers 1
+#endif /* !defined(H5Ovisit_vers) */
+
+#if !defined(H5Ovisit_by_name_vers)
+  #define H5Ovisit_by_name_vers 1
+#endif /* !defined(H5Ovisit_by_name_vers) */
+
+#if !defined(H5Pencode_vers)
+  #define H5Pencode_vers 1
+#endif /* !defined(H5Pencode_vers) */
+
 #if !defined(H5Pget_filter_vers)
   #define H5Pget_filter_vers 1
 #endif /* !defined(H5Pget_filter_vers) */
@@ -140,6 +200,10 @@
   #define H5Rget_obj_type_vers 1
 #endif /* !defined(H5Rget_obj_type_vers) */
 
+#if !defined(H5Sencode_vers)
+  #define H5Sencode_vers 1
+#endif /* !defined(H5Sencode_vers) */
+
 #if !defined(H5Tarray_create_vers)
   #define H5Tarray_create_vers 1
 #endif /* !defined(H5Tarray_create_vers) */
@@ -148,6 +212,10 @@
   #define H5Tcommit_vers 1
 #endif /* !defined(H5Tcommit_vers) */
 
+#if !defined(H5Tdecode_vers)
+  #define H5Tdecode_vers 1
+#endif /* !defined(H5Tdecode_vers) */
+
 #if !defined(H5Tget_array_dims_vers)
   #define H5Tget_array_dims_vers 1
 #endif /* !defined(H5Tget_array_dims_vers) */
@@ -164,6 +232,14 @@
   #define H5E_auto_t_vers 1
 #endif /* !defined(H5E_auto_t_vers) */
 
+#if !defined(H5O_info_t_vers)
+  #define H5O_info_t_vers 1
+#endif /* !defined(H5O_info_t_vers) */
+
+#if !defined(H5O_iterate_t_vers)
+  #define H5O_iterate_t_vers 1
+#endif /* !defined(H5O_iterate_t_vers) */
+
 #if !defined(H5Z_class_t_vers)
   #define H5Z_class_t_vers 1
 #endif /* !defined(H5Z_class_t_vers) */
@@ -192,6 +268,10 @@
   #define H5Dopen_vers 2
 #endif /* !defined(H5Dopen_vers) */
 
+#if !defined(H5Dread_chunk_vers)
+  #define H5Dread_chunk_vers 1
+#endif /* !defined(H5Dread_chunk_vers) */
+
 #if !defined(H5Eclear_vers)
   #define H5Eclear_vers 2
 #endif /* !defined(H5Eclear_vers) */
@@ -276,6 +356,10 @@
   #define H5Ovisit_by_name_vers 1
 #endif /* !defined(H5Ovisit_by_name_vers) */
 
+#if !defined(H5Pencode_vers)
+  #define H5Pencode_vers 1
+#endif /* !defined(H5Pencode_vers) */
+
 #if !defined(H5Pget_filter_vers)
   #define H5Pget_filter_vers 2
 #endif /* !defined(H5Pget_filter_vers) */
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 7ee9dd28b5d..ec2bace9bc0 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -655,6 +655,42 @@ foreach (h5_test ${H5_CHECK_TESTS})
   ADD_H5_EXE(${h5_test})
 endforeach ()
 
+#-- Adding test executables for API version defaulting
+#   Each is compiled with a different -DH5_USE_*_API and -DTEST_API_VERSION=*
+#   to verify that functions introduced after the configured API version
+#   default to their earliest version.
+#   The test source is auto-generated by bin/make_vers from H5vers.txt.
+#   Older API versions (v16-v114) require deprecated symbols to be enabled.
+#   NOTE: Cannot use ADD_H5_EXE here because multiple targets share one source
+#   file (tapi_version_default.c) with different compile definitions.
+if (HDF5_ENABLE_DEPRECATED_SYMBOLS)
+  set (API_VERSION_TEST_NUMBERS 16 18 110 112 114 200)
+else ()
+  set (API_VERSION_TEST_NUMBERS 200)
+endif ()
+foreach (api_num IN LISTS API_VERSION_TEST_NUMBERS)
+  set (test_name tapi_version_default_v${api_num})
+  add_executable (${test_name} ${HDF5_TEST_SOURCE_DIR}/tapi_version_default.c)
+  target_include_directories (${test_name} PRIVATE "${HDF5_SRC_INCLUDE_DIRS};${HDF5_SRC_BINARY_DIR};${HDF5_TEST_BINARY_DIR};$<$<BOOL:${HDF5_ENABLE_PARALLEL}>:${MPI_C_INCLUDE_DIRS}>")
+  target_compile_options(${test_name} PRIVATE ${HDF5_CMAKE_C_FLAGS})
+  target_compile_definitions(${test_name} PRIVATE
+      ${HDF5_TEST_COMPILE_DEFS_PRIVATE}
+      H5_USE_${api_num}_API
+      TEST_API_VERSION=${api_num}
+  )
+  if (NOT BUILD_SHARED_LIBS)
+    TARGET_C_PROPERTIES (${test_name} STATIC)
+    target_link_libraries (${test_name} PRIVATE ${HDF5_TEST_LIB_TARGET})
+  else ()
+    TARGET_C_PROPERTIES (${test_name} SHARED)
+    target_link_libraries (${test_name} PRIVATE ${HDF5_TEST_LIBSH_TARGET})
+  endif ()
+  set_target_properties (${test_name} PROPERTIES FOLDER test)
+  if (HDF5_ENABLE_FORMATTERS)
+    clang_format (HDF5_TEST_${test_name}_FORMAT ${test_name})
+  endif ()
+endforeach ()
+
 #-- Adding test for libinfo
 set (GREP_RUNNER ${PROJECT_BINARY_DIR}/GrepRunner.cmake)
 file (WRITE ${GREP_RUNNER} "file (STRINGS \${TEST_PROGRAM} TEST_RESULT REGEX \"SUMMARY OF THE HDF5 CONFIGURATION\")
diff --git a/test/CMakeTests.cmake b/test/CMakeTests.cmake
index e954e137b0c..91d387f102e 100644
--- a/test/CMakeTests.cmake
+++ b/test/CMakeTests.cmake
@@ -917,6 +917,20 @@ if ("H5TEST-error_test" MATCHES "${HDF5_DISABLE_TESTS_REGEX}")
   set_tests_properties (H5TEST-error_test PROPERTIES DISABLED true)
 endif ()
 
+#-- Adding tests for API version defaulting
+#   API_VERSION_TEST_NUMBERS is defined in CMakeLists.txt and already in scope
+foreach (api_num IN LISTS API_VERSION_TEST_NUMBERS)
+  add_test (NAME H5TEST-tapi_version_default_v${api_num}
+      COMMAND $<TARGET_FILE:tapi_version_default_v${api_num}>
+  )
+  set_tests_properties (H5TEST-tapi_version_default_v${api_num} PROPERTIES
+      WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/H5TEST
+  )
+  if ("H5TEST-tapi_version_default_v${api_num}" MATCHES "${HDF5_DISABLE_TESTS_REGEX}")
+    set_tests_properties (H5TEST-tapi_version_default_v${api_num} PROPERTIES DISABLED true)
+  endif ()
+endforeach ()
+
 #-- Adding test for links_env
 add_test (NAME H5TEST-links_env-clear-objects
     COMMAND ${CMAKE_COMMAND} -E remove
diff --git a/test/tapi_version_default.c b/test/tapi_version_default.c
new file mode 100644
index 00000000000..b14393093f0
--- /dev/null
+++ b/test/tapi_version_default.c
@@ -0,0 +1,392 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the LICENSE file, which can be found at the root of the source code       *
+ * distribution tree, or in https://www.hdfgroup.org/licenses.               *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/* Generated automatically by bin/make_vers -- do not edit */
+/* Add new versioned symbols to H5vers.txt file */
+
+/*
+ * Purpose: Tests that versioned API function macros default to the earliest
+ *          version for functions introduced after the configured global API
+ *          version. For example, with H5_USE_16_API, H5Sencode (introduced
+ *          in v1.8) should map to H5Sencode1, not H5Sencode2.
+ *
+ *          This test is compiled multiple times with different
+ *          -DH5_USE_*_API and -DTEST_API_VERSION=* flags to verify each
+ *          API version level.
+ */
+/* Include config header first to set its include guard */
+#include "H5pubconf.h"
+
+/* Clear all API version macros that may have been set by the
+ * global default configuration, so only the version under test
+ * is active when H5version.h is processed.
+ */
+#undef H5_USE_16_API_DEFAULT
+#undef H5_USE_16_API
+#undef H5_USE_18_API_DEFAULT
+#undef H5_USE_18_API
+#undef H5_USE_110_API_DEFAULT
+#undef H5_USE_110_API
+#undef H5_USE_112_API_DEFAULT
+#undef H5_USE_112_API
+#undef H5_USE_114_API_DEFAULT
+#undef H5_USE_114_API
+#undef H5_USE_200_API_DEFAULT
+#undef H5_USE_200_API
+
+/* Re-establish only the API version under test */
+#if TEST_API_VERSION == 16
+#define H5_USE_16_API 1
+#elif TEST_API_VERSION == 18
+#define H5_USE_18_API 1
+#elif TEST_API_VERSION == 110
+#define H5_USE_110_API 1
+#elif TEST_API_VERSION == 112
+#define H5_USE_112_API 1
+#elif TEST_API_VERSION == 114
+#define H5_USE_114_API 1
+#elif TEST_API_VERSION == 200
+#define H5_USE_200_API 1
+#else
+#error "TEST_API_VERSION not set to a valid value"
+#endif
+
+#include "h5test.h"
+
+/*
+ * Helper macro: check that a _vers macro equals an expected value.
+ */
+#define CHECK_VERS(func_name, expected)                                                                      \
+    do {                                                                                                     \
+        if (func_name##_vers != (expected)) {                                                                \
+            fprintf(stderr, "FAIL: %s_vers = %d, expected %d\n", #func_name, func_name##_vers, (expected));  \
+            nerrors++;                                                                                       \
+        }                                                                                                    \
+    } while (0)
+
+#define CHECK_VERS_T(type_name, expected)                                                                    \
+    do {                                                                                                     \
+        if (type_name##_t_vers != (expected)) {                                                              \
+            fprintf(stderr, "FAIL: %s_t_vers = %d, expected %d\n", #type_name, type_name##_t_vers,           \
+                    (expected));                                                                             \
+            nerrors++;                                                                                       \
+        }                                                                                                    \
+    } while (0)
+
+int
+main(void)
+{
+    int nerrors = 0;
+
+    TESTING("API version defaulting for versioned functions");
+
+#if TEST_API_VERSION == 16
+    printf("Configured with H5_USE_16_API\n");
+
+    CHECK_VERS(H5Acreate, 1);
+    CHECK_VERS(H5Aiterate, 1);
+    CHECK_VERS(H5Dcreate, 1);
+    CHECK_VERS(H5Dopen, 1);
+    CHECK_VERS(H5Dread_chunk, 1);
+    CHECK_VERS(H5Eclear, 1);
+    CHECK_VERS(H5Eget_auto, 1);
+    CHECK_VERS(H5Eprint, 1);
+    CHECK_VERS(H5Epush, 1);
+    CHECK_VERS(H5Eset_auto, 1);
+    CHECK_VERS(H5Ewalk, 1);
+    CHECK_VERS(H5Fget_info, 1);
+    CHECK_VERS(H5Gcreate, 1);
+    CHECK_VERS(H5Gopen, 1);
+    CHECK_VERS(H5Iregister_type, 1);
+    CHECK_VERS(H5Lget_info, 1);
+    CHECK_VERS(H5Lget_info_by_idx, 1);
+    CHECK_VERS(H5Literate, 1);
+    CHECK_VERS(H5Literate_by_name, 1);
+    CHECK_VERS(H5Lvisit, 1);
+    CHECK_VERS(H5Lvisit_by_name, 1);
+    CHECK_VERS(H5Oget_info, 1);
+    CHECK_VERS(H5Oget_info_by_idx, 1);
+    CHECK_VERS(H5Oget_info_by_name, 1);
+    CHECK_VERS(H5Ovisit, 1);
+    CHECK_VERS(H5Ovisit_by_name, 1);
+    CHECK_VERS(H5Pencode, 1);
+    CHECK_VERS(H5Pget_filter, 1);
+    CHECK_VERS(H5Pget_filter_by_id, 1);
+    CHECK_VERS(H5Pinsert, 1);
+    CHECK_VERS(H5Pregister, 1);
+    CHECK_VERS(H5Rdereference, 1);
+    CHECK_VERS(H5Rget_obj_type, 1);
+    CHECK_VERS(H5Sencode, 1);
+    CHECK_VERS(H5Tarray_create, 1);
+    CHECK_VERS(H5Tcommit, 1);
+    CHECK_VERS(H5Tdecode, 1);
+    CHECK_VERS(H5Tget_array_dims, 1);
+    CHECK_VERS(H5Topen, 1);
+
+    CHECK_VERS_T(H5E_auto, 1);
+    CHECK_VERS_T(H5O_info, 1);
+    CHECK_VERS_T(H5O_iterate, 1);
+    CHECK_VERS_T(H5Z_class, 1);
+
+#elif TEST_API_VERSION == 18
+    printf("Configured with H5_USE_18_API\n");
+
+    CHECK_VERS(H5Acreate, 2);
+    CHECK_VERS(H5Aiterate, 2);
+    CHECK_VERS(H5Dcreate, 2);
+    CHECK_VERS(H5Dopen, 2);
+    CHECK_VERS(H5Dread_chunk, 1);
+    CHECK_VERS(H5Eclear, 2);
+    CHECK_VERS(H5Eget_auto, 2);
+    CHECK_VERS(H5Eprint, 2);
+    CHECK_VERS(H5Epush, 2);
+    CHECK_VERS(H5Eset_auto, 2);
+    CHECK_VERS(H5Ewalk, 2);
+    CHECK_VERS(H5Fget_info, 1);
+    CHECK_VERS(H5Gcreate, 2);
+    CHECK_VERS(H5Gopen, 2);
+    CHECK_VERS(H5Iregister_type, 1);
+    CHECK_VERS(H5Lget_info, 1);
+    CHECK_VERS(H5Lget_info_by_idx, 1);
+    CHECK_VERS(H5Literate, 1);
+    CHECK_VERS(H5Literate_by_name, 1);
+    CHECK_VERS(H5Lvisit, 1);
+    CHECK_VERS(H5Lvisit_by_name, 1);
+    CHECK_VERS(H5Oget_info, 1);
+    CHECK_VERS(H5Oget_info_by_idx, 1);
+    CHECK_VERS(H5Oget_info_by_name, 1);
+    CHECK_VERS(H5Ovisit, 1);
+    CHECK_VERS(H5Ovisit_by_name, 1);
+    CHECK_VERS(H5Pencode, 1);
+    CHECK_VERS(H5Pget_filter, 2);
+    CHECK_VERS(H5Pget_filter_by_id, 2);
+    CHECK_VERS(H5Pinsert, 2);
+    CHECK_VERS(H5Pregister, 2);
+    CHECK_VERS(H5Rdereference, 1);
+    CHECK_VERS(H5Rget_obj_type, 2);
+    CHECK_VERS(H5Sencode, 1);
+    CHECK_VERS(H5Tarray_create, 2);
+    CHECK_VERS(H5Tcommit, 2);
+    CHECK_VERS(H5Tdecode, 1);
+    CHECK_VERS(H5Tget_array_dims, 2);
+    CHECK_VERS(H5Topen, 2);
+
+    CHECK_VERS_T(H5E_auto, 2);
+    CHECK_VERS_T(H5O_info, 1);
+    CHECK_VERS_T(H5O_iterate, 1);
+    CHECK_VERS_T(H5Z_class, 2);
+
+#elif TEST_API_VERSION == 110
+    printf("Configured with H5_USE_110_API\n");
+
+    CHECK_VERS(H5Acreate, 2);
+    CHECK_VERS(H5Aiterate, 2);
+    CHECK_VERS(H5Dcreate, 2);
+    CHECK_VERS(H5Dopen, 2);
+    CHECK_VERS(H5Dread_chunk, 1);
+    CHECK_VERS(H5Eclear, 2);
+    CHECK_VERS(H5Eget_auto, 2);
+    CHECK_VERS(H5Eprint, 2);
+    CHECK_VERS(H5Epush, 2);
+    CHECK_VERS(H5Eset_auto, 2);
+    CHECK_VERS(H5Ewalk, 2);
+    CHECK_VERS(H5Fget_info, 2);
+    CHECK_VERS(H5Gcreate, 2);
+    CHECK_VERS(H5Gopen, 2);
+    CHECK_VERS(H5Iregister_type, 1);
+    CHECK_VERS(H5Lget_info, 1);
+    CHECK_VERS(H5Lget_info_by_idx, 1);
+    CHECK_VERS(H5Literate, 1);
+    CHECK_VERS(H5Literate_by_name, 1);
+    CHECK_VERS(H5Lvisit, 1);
+    CHECK_VERS(H5Lvisit_by_name, 1);
+    CHECK_VERS(H5Oget_info, 1);
+    CHECK_VERS(H5Oget_info_by_idx, 1);
+    CHECK_VERS(H5Oget_info_by_name, 1);
+    CHECK_VERS(H5Ovisit, 1);
+    CHECK_VERS(H5Ovisit_by_name, 1);
+    CHECK_VERS(H5Pencode, 1);
+    CHECK_VERS(H5Pget_filter, 2);
+    CHECK_VERS(H5Pget_filter_by_id, 2);
+    CHECK_VERS(H5Pinsert, 2);
+    CHECK_VERS(H5Pregister, 2);
+    CHECK_VERS(H5Rdereference, 2);
+    CHECK_VERS(H5Rget_obj_type, 2);
+    CHECK_VERS(H5Sencode, 1);
+    CHECK_VERS(H5Tarray_create, 2);
+    CHECK_VERS(H5Tcommit, 2);
+    CHECK_VERS(H5Tdecode, 1);
+    CHECK_VERS(H5Tget_array_dims, 2);
+    CHECK_VERS(H5Topen, 2);
+
+    CHECK_VERS_T(H5E_auto, 2);
+    CHECK_VERS_T(H5O_info, 1);
+    CHECK_VERS_T(H5O_iterate, 1);
+    CHECK_VERS_T(H5Z_class, 2);
+
+#elif TEST_API_VERSION == 112
+    printf("Configured with H5_USE_112_API\n");
+
+    CHECK_VERS(H5Acreate, 2);
+    CHECK_VERS(H5Aiterate, 2);
+    CHECK_VERS(H5Dcreate, 2);
+    CHECK_VERS(H5Dopen, 2);
+    CHECK_VERS(H5Dread_chunk, 1);
+    CHECK_VERS(H5Eclear, 2);
+    CHECK_VERS(H5Eget_auto, 2);
+    CHECK_VERS(H5Eprint, 2);
+    CHECK_VERS(H5Epush, 2);
+    CHECK_VERS(H5Eset_auto, 2);
+    CHECK_VERS(H5Ewalk, 2);
+    CHECK_VERS(H5Fget_info, 2);
+    CHECK_VERS(H5Gcreate, 2);
+    CHECK_VERS(H5Gopen, 2);
+    CHECK_VERS(H5Iregister_type, 1);
+    CHECK_VERS(H5Lget_info, 2);
+    CHECK_VERS(H5Lget_info_by_idx, 2);
+    CHECK_VERS(H5Literate, 2);
+    CHECK_VERS(H5Literate_by_name, 2);
+    CHECK_VERS(H5Lvisit, 2);
+    CHECK_VERS(H5Lvisit_by_name, 2);
+    CHECK_VERS(H5Oget_info, 3);
+    CHECK_VERS(H5Oget_info_by_idx, 3);
+    CHECK_VERS(H5Oget_info_by_name, 3);
+    CHECK_VERS(H5Ovisit, 3);
+    CHECK_VERS(H5Ovisit_by_name, 3);
+    CHECK_VERS(H5Pencode, 2);
+    CHECK_VERS(H5Pget_filter, 2);
+    CHECK_VERS(H5Pget_filter_by_id, 2);
+    CHECK_VERS(H5Pinsert, 2);
+    CHECK_VERS(H5Pregister, 2);
+    CHECK_VERS(H5Rdereference, 2);
+    CHECK_VERS(H5Rget_obj_type, 2);
+    CHECK_VERS(H5Sencode, 2);
+    CHECK_VERS(H5Tarray_create, 2);
+    CHECK_VERS(H5Tcommit, 2);
+    CHECK_VERS(H5Tdecode, 1);
+    CHECK_VERS(H5Tget_array_dims, 2);
+    CHECK_VERS(H5Topen, 2);
+
+    CHECK_VERS_T(H5E_auto, 2);
+    CHECK_VERS_T(H5O_info, 2);
+    CHECK_VERS_T(H5O_iterate, 2);
+    CHECK_VERS_T(H5Z_class, 2);
+
+#elif TEST_API_VERSION == 114
+    printf("Configured with H5_USE_114_API\n");
+
+    CHECK_VERS(H5Acreate, 2);
+    CHECK_VERS(H5Aiterate, 2);
+    CHECK_VERS(H5Dcreate, 2);
+    CHECK_VERS(H5Dopen, 2);
+    CHECK_VERS(H5Dread_chunk, 1);
+    CHECK_VERS(H5Eclear, 2);
+    CHECK_VERS(H5Eget_auto, 2);
+    CHECK_VERS(H5Eprint, 2);
+    CHECK_VERS(H5Epush, 2);
+    CHECK_VERS(H5Eset_auto, 2);
+    CHECK_VERS(H5Ewalk, 2);
+    CHECK_VERS(H5Fget_info, 2);
+    CHECK_VERS(H5Gcreate, 2);
+    CHECK_VERS(H5Gopen, 2);
+    CHECK_VERS(H5Iregister_type, 1);
+    CHECK_VERS(H5Lget_info, 2);
+    CHECK_VERS(H5Lget_info_by_idx, 2);
+    CHECK_VERS(H5Literate, 2);
+    CHECK_VERS(H5Literate_by_name, 2);
+    CHECK_VERS(H5Lvisit, 2);
+    CHECK_VERS(H5Lvisit_by_name, 2);
+    CHECK_VERS(H5Oget_info, 3);
+    CHECK_VERS(H5Oget_info_by_idx, 3);
+    CHECK_VERS(H5Oget_info_by_name, 3);
+    CHECK_VERS(H5Ovisit, 3);
+    CHECK_VERS(H5Ovisit_by_name, 3);
+    CHECK_VERS(H5Pencode, 2);
+    CHECK_VERS(H5Pget_filter, 2);
+    CHECK_VERS(H5Pget_filter_by_id, 2);
+    CHECK_VERS(H5Pinsert, 2);
+    CHECK_VERS(H5Pregister, 2);
+    CHECK_VERS(H5Rdereference, 2);
+    CHECK_VERS(H5Rget_obj_type, 2);
+    CHECK_VERS(H5Sencode, 2);
+    CHECK_VERS(H5Tarray_create, 2);
+    CHECK_VERS(H5Tcommit, 2);
+    CHECK_VERS(H5Tdecode, 1);
+    CHECK_VERS(H5Tget_array_dims, 2);
+    CHECK_VERS(H5Topen, 2);
+
+    CHECK_VERS_T(H5E_auto, 2);
+    CHECK_VERS_T(H5O_info, 2);
+    CHECK_VERS_T(H5O_iterate, 2);
+    CHECK_VERS_T(H5Z_class, 2);
+
+#elif TEST_API_VERSION == 200
+    printf("Configured with H5_USE_200_API\n");
+
+    CHECK_VERS(H5Acreate, 2);
+    CHECK_VERS(H5Aiterate, 2);
+    CHECK_VERS(H5Dcreate, 2);
+    CHECK_VERS(H5Dopen, 2);
+    CHECK_VERS(H5Dread_chunk, 2);
+    CHECK_VERS(H5Eclear, 2);
+    CHECK_VERS(H5Eget_auto, 2);
+    CHECK_VERS(H5Eprint, 2);
+    CHECK_VERS(H5Epush, 2);
+    CHECK_VERS(H5Eset_auto, 2);
+    CHECK_VERS(H5Ewalk, 2);
+    CHECK_VERS(H5Fget_info, 2);
+    CHECK_VERS(H5Gcreate, 2);
+    CHECK_VERS(H5Gopen, 2);
+    CHECK_VERS(H5Iregister_type, 2);
+    CHECK_VERS(H5Lget_info, 2);
+    CHECK_VERS(H5Lget_info_by_idx, 2);
+    CHECK_VERS(H5Literate, 2);
+    CHECK_VERS(H5Literate_by_name, 2);
+    CHECK_VERS(H5Lvisit, 2);
+    CHECK_VERS(H5Lvisit_by_name, 2);
+    CHECK_VERS(H5Oget_info, 3);
+    CHECK_VERS(H5Oget_info_by_idx, 3);
+    CHECK_VERS(H5Oget_info_by_name, 3);
+    CHECK_VERS(H5Ovisit, 3);
+    CHECK_VERS(H5Ovisit_by_name, 3);
+    CHECK_VERS(H5Pencode, 2);
+    CHECK_VERS(H5Pget_filter, 2);
+    CHECK_VERS(H5Pget_filter_by_id, 2);
+    CHECK_VERS(H5Pinsert, 2);
+    CHECK_VERS(H5Pregister, 2);
+    CHECK_VERS(H5Rdereference, 2);
+    CHECK_VERS(H5Rget_obj_type, 2);
+    CHECK_VERS(H5Sencode, 2);
+    CHECK_VERS(H5Tarray_create, 2);
+    CHECK_VERS(H5Tcommit, 2);
+    CHECK_VERS(H5Tdecode, 2);
+    CHECK_VERS(H5Tget_array_dims, 2);
+    CHECK_VERS(H5Topen, 2);
+
+    CHECK_VERS_T(H5E_auto, 2);
+    CHECK_VERS_T(H5O_info, 2);
+    CHECK_VERS_T(H5O_iterate, 2);
+    CHECK_VERS_T(H5Z_class, 2);
+
+#else
+#error "TEST_API_VERSION not set to a valid value"
+#endif
+
+    if (nerrors) {
+        H5_FAILED();
+        fprintf(stderr, "    %d version check%s failed\n", nerrors, nerrors > 1 ? "s" : "");
+        return 1;
+    }
+
+    PASSED();
+    return 0;
+}