* fix --enable-... parameers

credits to Elias Pipping

[[Imported from SVN: r5297]]

m4/dune_all.m4

@@ -24,7 +24,7 @@ AC_DEFUN([DUNE_CHECK_ALL],[
   AC_ARG_ENABLE(enabledist,
     AC_HELP_STRING([--enable-dist],
                  [go into create-tarballs-mode [[default=no]]]),
-    [enabledist=$enable],
+    [enabledist=$enableval],
     [enabledist=no]
   )
   AM_CONDITIONAL(MAKEDIST, test x$enabledist = xyes)

m4/dune_compiler.m4

@@ -6,7 +6,7 @@ AC_DEFUN([DUNE_CHECK_COMPILER],[
 AC_ARG_ENABLE(compilercheck,
   AC_HELP_STRING([--enable-compilercheck],
                  [check for supported compilers [[default=yes]]]),
-  [compilercheck=$enable],
+  [compilercheck=$enableval],
   [compilercheck=yes]
 )
 

m4/static_assert.m4

@@ -2,8 +2,8 @@ AC_DEFUN([GXX0X],[
   AC_REQUIRE([AC_PROG_CXX])
   AC_ARG_ENABLE(gxx0xcheck,
 		AC_HELP_STRING([--disable-gxx0xcheck],
-                 [try to enabel c++0x feature for g++ [[default=yes]]]),
-		  		 [gxx0xcheck=$enable],
+                 [try to enable c++0x feature for g++ [[default=yes]]]),
+				 [gxx0xcheck=$enableval],
 				 [gxx0xcheck=yes])
   if test "x$GXX" = xyes && test "x$gxx0xcheck" = xyes; then
     AC_MSG_CHECKING([whether g++ accepts -std=c++0x])