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how to check and add a library if it exists

From: Andrew Makhorin
Subject: how to check and add a library if it exists
Date: Mon, 6 Nov 2006 15:49:36 +0300

I made a mistake in my previous post, sorry.

My question is probably very simple to autoconf experts, however,
I could not find the answer in the autoconf documentation.

I need to include a check in to see if libgmp.a (the GNU
bignum library) exists. And if it exists, the configure script has to
do the following:

1) change one line in some header file (by sed, for example);

2) add the option '-lgmp' in makefiles, where binaries are compiled.

The trouble is that a check like AC_CHECK_LIB(gmp, mpq_init) fails,
because the header <gmp.h> should be included in a test program.
However, it is unclear how to do that.

Thank you,

Andrew Makhorin

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