X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=configure.ac;h=814d8c81bbbdf41099438d503f701e596ef3a0db;hb=f0a6c0a0d14545c81757934c3679511b63b6c82f;hp=ad0cf5fb78e7626f71b8d30aef1accb61d1586ea;hpb=e5b9965c183e761aefadcb975930449bcb4ab6eb;p=kconfig-frontends

diff --git a/configure.ac b/configure.ac
index ad0cf5f..814d8c8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,6 +30,10 @@ AS_IF(
 
 AM_INIT_AUTOMAKE([foreign])
 
+# For releases, enable silent rules, unless the user explicitly
+# disables them.
+# For the devel tree, do build with verbose output, unless user
+# explicitly enables silent rules
 AS_IF(
     [test "$(${srcdir}/scripts/version.sh --internal)" = "git"],
     [AM_SILENT_RULES],
@@ -63,7 +67,7 @@ AC_ARG_ENABLE(
         [*],   [wall_CFLAGS=""])])
 AC_SUBST([wall_CFLAGS],[${wall_CFLAGS}])
 
-# For releases, do not build with -Werror, unless the user explcitly
+# For releases, do not build with -Werror, unless the user explicitly
 # requests to build with -Werror.
 # For the devel tree, do build with -Werror by default, unless user
 # explicitly disables -Werror
@@ -93,9 +97,7 @@ AC_ARG_ENABLE(
         [yes], [root_menu=Configuration],
         [no],  [root_menu=],
                [# Escape the $ signs, otherwise they would get munged by make
-                # Also, append a space at the end, to separate the package
-                # name from the literal 'Configuration'
-                root_menu="$( echo "$enableval" |sed -r -e 's/\$/\\$$/g;' )"])])
+                root_menu="$( echo "$enableval" |sed -e 's/\$/\\$$/g;' )"])])
 AC_SUBST([root_menu], [${root_menu=Configuration}])
 
 AC_ARG_ENABLE(
@@ -217,9 +219,22 @@ AS_IF(
 AS_IF(
     [test "$need_pkgconfig" = "yes"],
     [PKG_PROG_PKG_CONFIG()])
+# Look for `lex'. If it cannot be found, autoconf sets $LEX to ':'.
 AC_PROG_LEX
+AS_IF(
+    [test "$LEX" = ":"],
+    [AC_MSG_ERROR([can not find a lexer generator (such as lex or flex)])])
 AC_SUBST([AM_LFLAGS], ["-L -P zconf"])
+# Look for `yacc'. If it cannot be found, autoconf sets $YACC to 'yacc'.
 AC_PROG_YACC
+AS_IF(
+    [test "$YACC" = "yacc"],
+    [AC_CHECK_PROGS(
+        [YACC_IN_PATH],
+        [yacc])]
+     AS_IF(
+        [test -z "$YACC_IN_PATH"],
+        [AC_MSG_ERROR([can not find a parser generator (such as yacc or bison)])]))
 AC_SUBST([AM_YFLAGS], ["-t -l -p zconf"])
 
 #----------------------------------------