Fix: Make include of libpq-fe.h work on Enterprise Linux too#2888
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... using __has_include. Gcc supports __has_include since at least version 9.5: https://gcc.gnu.org/onlinedocs/gcc-9.5.0/cpp/_005f_005fhas_005finclude.html Clang supports __has_include since at least 5.0.0: https://releases.llvm.org/5.0.0/tools/clang/docs/LanguageExtensions.html#include-file-checking-macros
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What
Make include of libpq-fe.h work on Enterprise Linux too
using __has_include.
Why
On Enterprise Linux libpq-fe.h is not installed under postgresql so the include fails. Check for the expected location and fall back to looking directly on the include path.
References
Gcc supports __has_include since at least version 9.5: https://gcc.gnu.org/onlinedocs/gcc-9.5.0/cpp/_005f_005fhas_005finclude.html
Clang supports __has_include since at least 5.0.0: https://releases.llvm.org/5.0.0/tools/clang/docs/LanguageExtensions.html#include-file-checking-macros
I considered adding a version requirement on Gcc in the install instructions but as i don't know what version is required for other features used i decided against it. Please let me know if i should reconsider.