(TOOLKIT_DEFINES): Define.

(ALL_CFLAGS): Insert $(TOOLKIT_DEFINES) here.

src/Makefile.in

@@ -239,6 +239,12 @@ LOCALCPP= localcpp
 SHORT= shortnames
 #endif
 
+#ifdef USE_X_TOOLKIT
+TOOLKIT_DEFINES = -DUSE_@X_TOOLKIT_TYPE@
+#else
+TOOLKIT_DEFINES =
+#endif
+
 /* DO NOT use -R.  There is a special hack described in lastfile.c
    which is used instead.  Some initialized data areas are modified
    at initial startup, then labeled as part of the text area when
@@ -252,7 +258,7 @@ SHORT= shortnames
 
 /* C_SWITCH_X_SITE must come before C_SWITCH_X_MACHINE and C_SWITCH_X_SYSTEM
    since it may have -I options that should override those two.  */
-ALL_CFLAGS=-Demacs -DHAVE_CONFIG_H $(MYCPPFLAG) -I. -I${srcdir} C_SWITCH_MACHINE C_SWITCH_SYSTEM C_SWITCH_SITE C_SWITCH_X_SITE C_SWITCH_X_MACHINE C_SWITCH_X_SYSTEM ${CFLAGS}
+ALL_CFLAGS=-Demacs -DHAVE_CONFIG_H $(TOOLKIT_DEFINES) $(MYCPPFLAG) -I. -I${srcdir} C_SWITCH_MACHINE C_SWITCH_SYSTEM C_SWITCH_SITE C_SWITCH_X_SITE C_SWITCH_X_MACHINE C_SWITCH_X_SYSTEM ${CFLAGS}
 .c.o:
 	$(CC) -c $(CPPFLAGS) $(ALL_CFLAGS) $<