diff --git a/build-cmake.sh b/build-cmake.sh
index 2f2c344..666d763 100755
--- a/build-cmake.sh
+++ b/build-cmake.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 set -eu
-cmake -B build -DCMAKE_INSTALL_PREFIX="${PREFIX:-$PWD}"
+prefix=${PREFIX:-$PWD}
+cmake -B build -DCMAKE_INSTALL_PREFIX="$prefix"
 cmake --build build --config Release
 cmake --install build --config Release
 (test -d lib64 && ln -f -s lib64 lib) || true
diff --git a/build-meson.sh b/build-meson.sh
index d6364b7..4ff6fdc 100755
--- a/build-meson.sh
+++ b/build-meson.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 set -eu
-meson setup build --prefix="${PREFIX:-$PWD}"
+prefix=${PREFIX:-$PWD}
+meson setup build --prefix="$prefix" --buildtype=release
 meson compile -C build
 meson install -C build
 (test -d lib64 && ln -f -s lib64 lib) || true
diff --git a/meson.build b/meson.build
index 954c8dc..b5d2fce 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project(
   'mpi-stubs',
   'c',
-  version: '4.2',
+  version: '5.0',
   license: 'MIT',
   meson_version: '>=1.0.0',
 )