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postgresql12/postgresql-llvm-optional.patch

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--- src/Makefile.global.in.orig
+++ src/Makefile.global.in
@@ -192,7 +192,12 @@ with_krb_srvnam = @with_krb_srvnam@
with_ldap = @with_ldap@
with_libxml = @with_libxml@
with_libxslt = @with_libxslt@
-with_llvm = @with_llvm@
+# Only build for LLVM, if the core supports it and the llvm and clang packages are installed.
+ifeq (@with_llvm@ $(wildcard /usr/bin/clang /usr/bin/llvm-lto),yes /usr/bin/clang /usr/bin/llvm-lto)
+with_llvm = yes
+else
+with_llvm = no
+endif
with_system_tzdata = @with_system_tzdata@
with_uuid = @with_uuid@
with_zlib = @with_zlib@