+ PG_LIBS=-lpq
+ AC_SUBST(PG_LIBS)
+
+ PKG_CHECK_EXISTS(libssl,
+ AC_DEFINE([USE_SSL],1,
+ [Define to 1 if the openssl library is present.])
+ ,)
+
+ # Now verify that we can actually link against libpq. If we are
+ # cross-compiling and picked up a host libpq, or if libpq is just
+ # badly installed, this will fail.
+ AC_CACHE_CHECK(
+ [whether -lpq links successfully],
+ [pspp_cv_have_libpq],
+ [save_CPPFLAGS=$CPPFLAGS
+ save_LIBS=$LIBS
+ save_LDFLAGS=$LDFLAGS
+ CPPFLAGS="$PG_CFLAGS $CPPFLAGS"
+ LIBS="$PG_LIBS $LIBS"
+ LDFLAGS="$PG_LDFLAGS $LDFLAGS"
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [#include <libpq-fe.h>
+ ], [PQfinish (0);])],
+ [pspp_cv_have_libpq=yes],
+ [pspp_cv_have_libpq=no])
+ CPPFLAGS=$save_CPPFLAGS
+ LIBS=$save_LIBS
+ LDFLAGS=$save_LDFLAGS])
+
+ if test $pspp_cv_have_libpq = yes; then
+ PSQL_SUPPORT=yes
+ AC_DEFINE([PSQL_SUPPORT], [1],
+ [Define to 1 if building in support for reading from postgres
+ databases.])
+ else
+ PSQL_SUPPORT=no
+ PG_CONFIG=
+ PG_CFLAGS=
+ PG_LDFLAGS=
+ PG_LIBS=
+ fi
+else
+ PSQL_SUPPORT=no
+ pspp_cv_have_libpq=no
+fi
+AC_SUBST([PSQL_SUPPORT])
+
+dnl Check for libxml2
+PKG_CHECK_MODULES(
+ [LIBXML2], [libxml-2.0], [], [PSPP_REQUIRED_PREREQ([libxml2])])
+
+dnl Check for zlib.
+AC_SEARCH_LIBS([gzopen], [z], [], [PSPP_REQUIRED_PREREQ([zlib])])
+AC_CHECK_HEADERS([zlib.h], [], [PSPP_REQUIRED_PREREQ([zlib])])
+
+dnl Avoid interference between zlib's crc32() function and gnulib's
+dnl crc32() function, which have different signatures. PSPP calls
+dnl only gnulib's crc32() directly, but it calls zlib's crc32()
+dnl indirectly through other zlib calls. If we don't rename gnulib's
+dnl crc32(), then zlib will call gnulib's version instead of its own,
+dnl causing failures. (This can happen even if zlib isn't detected
+dnl directly, because other libraries that PSPP uses, e.g. libpng,
+dnl sometimes use zlib themselves.)
+AC_DEFINE(
+ [crc32], [gl_crc32],
+ [Avoid making zlib call gnulib's crc32() instead of its own.])
+
+AC_ARG_WITH(
+ [perl-module],
+ [AS_HELP_STRING([--without-perl-module], [do not build the Perl module])],
+ [case $with_perl_module in # (
+ yes|no) ;; # (
+ *) AC_MSG_FAILURE([--with-perl-module argument must be 'yes' or 'no']) ;;
+ esac
+ WITH_PERL_MODULE=$with_perl_module],
+ [if test x"$cross_compiling" != x"yes"; then
+ WITH_PERL_MODULE=yes
+ else
+ WITH_PERL_MODULE=no
+ fi])
+AC_SUBST([WITH_PERL_MODULE])
+AM_CONDITIONAL(WITH_PERL_MODULE, test $WITH_PERL_MODULE = yes)
+
+AC_SEARCH_LIBS([cblas_dsdot], [gslcblas],,[PSPP_REQUIRED_PREREQ([libgslcblas])])
+PKG_CHECK_MODULES([GSL], [gsl >= 1.13], [],
+ AC_SEARCH_LIBS([gsl_poly_eval_derivs], [gsl],,[PSPP_REQUIRED_PREREQ([gsl version 1.13 or later])]))
+
+
+PSPP_GSL_NEEDS_FGNU89_INLINE