optional blas added to cmake targets

Author: galabovaa

cmake/highs-config.cmake.in

@@ -7,6 +7,16 @@ set(@PACKAGE_PREFIX@_VERSION @PROJECT_VERSION@)
 include(CMakeFindDependencyMacro)
 find_dependency(Threads)
 
+# Only look for BLAS if highs was built with it
+set(_HIGHS_HAVE_BLAS @HIPO@)
+
+if(_HIGHS_HAVE_BLAS)
+    find_dependency(BLAS)
+endif()
+
+# Let users know about optional features
+set(HIGHS_HAVE_BLAS ${_HIGHS_HAVE_BLAS})
+
 @CONF_ZLIB@
 
 include("${CMAKE_CURRENT_LIST_DIR}/highs-targets.cmake")