New libm test for slang

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@176 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

@@ -15,6 +15,7 @@ CVS code
 	  Christian Weisgerber)
 - configure.in:
 	- New slang test code (Albert Chin-A-Young)
+	- Test for libm if --with-slang called.
 
 nano-0.9.15 - 08/03/2000
 - Changed edit_update call to take arguments TOP, CENTER or BOTTOM.

Makefile.in

@@ -10,6 +10,7 @@
 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 # PARTICULAR PURPOSE.
 
+
 SHELL = @SHELL@
 
 srcdir = @srcdir@

config.h.in

@@ -172,6 +172,9 @@
 /* Define if you have the i library (-li).  */
 #undef HAVE_LIBI
 
+/* Define if you have the m library (-lm).  */
+#undef HAVE_LIBM
+
 /* Name of package */
 #undef PACKAGE
 

configure.in

@@ -38,6 +38,16 @@ AC_ARG_WITH(slang,
 	    CPPFLAGS="-I$with_slang/include $CPPFLAGS"
 	fi
 
+	AC_CHECK_LIB(m, sin)
+	if test "$ac_cv_lib_m_sin" != "yes"
+	then
+	    AC_MSG_WARN([
+*** The libm library was not found.  Some BSD systems require libm
+*** in order for slang to work.  If nano fails to build, consider
+*** obtaining libm or running configure without the --with-slang option
+])
+	fi
+
 	AC_CHECK_HEADER(slcurses.h,
 	    AC_CHECK_LIB(slang, SLcurses_newwin, [
 		AC_DEFINE(USE_SLANG)
@@ -150,6 +160,7 @@ then
 	LDFLAGS="$LDFLAGS $glib_libs"
 fi
 
+
 dnl i18n stuff - pretty incomplete for now
 AM_GNU_GETTEXT