configure.ac: Link with "pthread" if no libs are given explicitly.

diff --git a/configure.ac b/configure.ac
index 680d432..70be87c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -80,11 +80,15 @@ then
        AC_CHECK_HEADERS(population.h,
                         [with_libpopulation="yes"],
                         [with_libpopulation="no"])
-       echo "with_libpopulation = $with_libpopulation"
 fi
 
 if test "x$with_libpopulation" = "xyes"
 then    
+       if test "x$LIBPOPULATION_LIBS" = "x"
+       then
+               LIBPOPULATION_LIBS="-lpthread"
+       fi
+
        AC_CHECK_LIB(population, population_create,
                     [with_libpopulation="yes"],
                     [with_libpopulation="no"],