While building libmcrypt on Solaris 10 with Studio 12, I have seen that the libtool blindly expects gcc to be present, therefore causing the build to throw errors.
Additionally, there are type mismatch warnings during the compile using Suns compiler.
A gzipped test file with the build history is attached.
compressed text file with the configure and build
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Created a sourceforge account for myself now (I submitted this bug report).
I can make a Solaris 10 on SPARC system available, should you need one.