configure.ac: Check `libm.a' for `modf'.

diff --git a/configure.ac b/configure.ac
index d625a0c..b1037ae 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -54,6 +54,7 @@ AC_CHECK_DECLS([environ])
 AC_CHECK_DECLS([_sys_siglist])
 
 dnl Libraries.
+AC_SEARCH_LIBS([modf], [m])
 AC_SEARCH_LIBS([socket], [socket])
 AC_SEARCH_LIBS([gethostbyname], [nsl resolv])