diff -r a09abc0604d6 pygments/lexers/compiled.py
--- a/pygments/lexers/compiled.py	Wed Jun 25 14:47:12 2008 +0200
+++ b/pygments/lexers/compiled.py	Wed Jul 02 11:34:48 2008 +0200
@@ -123,6 +123,7 @@
         ],
         'if0': [
             (r'^\s*#if.*?(?<!\\)\n', Comment, '#push'),
+            (r'^\s*#else\s*.*?\n', Comment.Preproc, '#pop'),
             (r'^\s*#endif.*?(?<!\\)\n', Comment, '#pop'),
             (r'.*?\n', Comment),
         ]