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Diffstat (limited to 'config/override.m4')
| -rw-r--r-- | config/override.m4 | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/config/override.m4 b/config/override.m4 index 52bd1c3d1b..b5ce6545ab 100644 --- a/config/override.m4 +++ b/config/override.m4 @@ -101,4 +101,16 @@ m4_define([_AC_CHECK_DECLS], ]) +dnl If flex/lex are not found, the top level configure sets LEX to +dnl "/path_to/missing flex". When AC_PROG_LEX tries to find the flex +dnl output file, it calls $LEX to do so, but the current lightweight +dnl "missing" won't create a file. This results in an error. +dnl Avoid calling the bulk of AC_PROG_LEX when $LEX is "missing". +AC_DEFUN_ONCE([AC_PROG_LEX], +[AC_CHECK_PROGS(LEX, flex lex, :) +case "$LEX" in + :|*"missing "*) ;; + *) _AC_PROG_LEX_YYTEXT_DECL ;; +esac]) + ]) |