I'm trying to compile and install package "gnupg-2.0.4" on a RHEL 4.5 32bit x86 system. I have downloaded, successfully compiled and installed multiple prereq libraries including "libgcrypt 1.2.4". But when I try to compile gnupg it always aborts with a fatal error message "libgcrypt 1.2.0 too old need libgcrypt 1.2.2". When I run configure of gnupg before compile the return status of the libgcrypt check shows libgcrypt 1.2.4 was recognized. The gnupg configure process sees libgcrypt 1.2.4, but the gnupg compile process is only seeing an older down level version of libgcrypt. How do I make the gnupg compile process recognize and use the later level libgcrypt library I just installed?

I've seen some packages before just look at the RPM database for file/package information. If you've installed a library from source, it might not pick it up if the configure program or makefile is just checking the RPM. If there's a "configure" script, try running it with "--help", and it'll usually pop up a flag-list, which should tell you how to disable checking for that library, if you're sure you've got it installed.

Just a thought.

I managed to resolve this one myself, so I'll document the fix here to make reading this thread useful to someone else with a similar problem.
The problem was that down level version 1.2.0 of the libgcrypt library was already present in /usr/lib and the install process for version 1.2.4 of the libgcrypt library that I built placed it in /usr/local/lib. Seems the gnupg configure check found the correct version of libgcrypt in /usr/local/lib but the gnupg compile process could only see the old version of libgcrypt in /usr/lib. Eliminating the old version of libgcrypt in /usr/lib fixed the compile fatal error.

Thanks for sharing the solution .