php-src/ext/gmp/config.m4

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PHP_ARG_WITH(gmp, for GNU MP support,
[ --with-gmp[=DIR] Include GNU MP support])
if test "$PHP_GMP" != "no"; then
for i in $PHP_GMP /usr/local /usr; do
test -f $i/include/gmp.h && GMP_DIR=$i && break
done
if test -z "$GMP_DIR"; then
AC_MSG_ERROR(Unable to locate gmp.h)
fi
PHP_CHECK_LIBRARY(gmp, __gmpz_rootrem,
[],[
AC_MSG_ERROR([GNU MP Library version 4.2 or greater required.])
],[
-L$GMP_DIR/$PHP_LIBDIR
])
PHP_ADD_LIBRARY_WITH_PATH(gmp, $GMP_DIR/$PHP_LIBDIR, GMP_SHARED_LIBADD)
PHP_ADD_INCLUDE($GMP_DIR/include)
PHP_NEW_EXTENSION(gmp, gmp.c, $ext_shared,, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
PHP_SUBST(GMP_SHARED_LIBADD)
AC_DEFINE(HAVE_GMP, 1, [ ])
fi