build: Fix check for lopsub.

If the lopsub library is not installed, HAVE_LOPSUB should be set to
"no".  The current code in configure.ac gets this wrong, causing the
configure script to succeed even if the library is not installed.

diff --git a/configure.ac b/configure.ac
index a589613b5ad5f000edb65f77e6f73101f1d34ae2..ee1c3d82697e023185803af65b2dc7604c047002 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -76,7 +76,7 @@ STASH_FLAGS
 LIB_ARG_WITH([lopsub], [-llopsub])
 HAVE_LOPSUB=yes
 AC_CHECK_HEADER(lopsub.h, [], [HAVE_LOPSUB=no])
-AC_CHECK_LIB([lopsub], [lls_merge], [], [HAVE_LOPSUB=yes])
+AC_CHECK_LIB([lopsub], [lls_merge], [], [HAVE_LOPSUB=no])
 if test $HAVE_LOPSUB = no; then AC_MSG_ERROR([
        The lopsub library is required to build this software, but
        the above checks indicate it is not installed on your system.