diff options
Diffstat (limited to 'aclocal.m4')
| -rw-r--r-- | aclocal.m4 | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/aclocal.m4 b/aclocal.m4 index 4729a1ca16..6b96a7c084 100644 --- a/aclocal.m4 +++ b/aclocal.m4 @@ -984,8 +984,11 @@ else fi; changequote([, ])dnl ]) -FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-lt],[3.1.7], - [AC_MSG_ERROR([Alex version 3.1.7 or later is required to compile GHC.])])[] +if test ! -f compiler/parser/Lexer.hs +then + FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-lt],[3.1.7], + [AC_MSG_ERROR([Alex version 3.1.7 or later is required to compile GHC.])])[] +fi AlexVersion=$fptools_cv_alex_version; AC_SUBST(AlexVersion) ]) |