Separate CFLAGS from CXXFLAGS. Was breaking with -std=c++11 on clang

Makefile.in

@@ -47,8 +47,7 @@ DEFS += -D_FORTIFY_SOURCE=2
 # DEFS += -DMTRACE=1
 CXXFLAGS = @CXXFLAGS@ $(DBGFLAGS) $(CCOPT)
 CPPFLAGS = @CPPFLAGS@ $(DEFS)
-export CFLAGS = $(CXXFLAGS)
-# CFLAGS = $(DEFS) $(INCLS)
+CFLAGS = @CFLAGS@ $(DBGFLAGS) $(CCOPT)
 STATIC =
 LDFLAGS = @LDFLAGS@ $(DBGFLAGS) $(STATIC)
 LIBS =  @LIBNSOCK_LIBS@ @LIBNBASE_LIBS@ @LIBPCRE_LIBS@ @LIBPCAP_LIBS@ $(OPENSSL_LIBS) libnetutil/libnetutil.a @LIBDNET_LIBS@ @LIBLUA_LIBS@ @LIBLINEAR_LIBS@ @LIBS@

configure

@@ -4403,6 +4403,8 @@ if test -n "$GXX"; then
   CXXFLAGS="$CXXFLAGS -Wall -fno-strict-aliasing"
 fi
 
+CFLAGS="$CFLAGS -Wall"
+
 # Remember that all following tests will run with this CXXFLAGS by default
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for __func__" >&5
 $as_echo_n "checking for __func__... " >&6; }
@@ -6874,6 +6876,7 @@ fi
 
 
 
+
 LIBLINEARDIR=liblinear
 have_liblinear=no
 

configure.ac

@@ -71,6 +71,8 @@ if test -n "$GXX"; then
   CXXFLAGS="$CXXFLAGS -Wall -fno-strict-aliasing"
 fi
 
+CFLAGS="$CFLAGS -Wall"
+
 # Remember that all following tests will run with this CXXFLAGS by default
 AC_MSG_CHECKING(for __func__)
 AH_TEMPLATE(__func__, [C99-specified function identifier])
@@ -680,6 +682,7 @@ AC_SUBST(LUA_DIST_CLEAN)
 AC_SUBST(INSTALLNSE)
 AC_SUBST(NSE_CHECK)
 AC_SUBST(CXXFLAGS)
+AC_SUBST(CFLAGS)
 
 
 LIBLINEARDIR=liblinear