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gwright@antiope.com authored
ghc fails to build if you use an external gmp library. This is because ghc requires the header file gmp.h, which used to be provided by the internal gmp source code. The file gmp.h is no longer part of the gmp source code, but is generated as part of the build procedure. If an external gmp is specified, the internal gmp is not build and the gmp.h file never gets generated. Of course, it was a bad idea anyway to use a header file from a potentially different version of the library. The patch sets HAVE_LIB_GMP if the gmp library is found during configuration and conditionalizes including the library header file on it.
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