I wasted a lot of time before I figured out that I needed to add those
square brackets to get this to work. Sigh...
---
configure.ac | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index 6bbec59..271eec3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -141,7 +141,7 @@ if test "x$enable_documentation" = "xyes"; then
AC_MSG_ERROR([Documentation build requested but graphviz's dot
not found. Install graphviz or disable the documentation using
--disable-documentation])
fi
AC_MSG_CHECKING([for compatible dot version])
- dot_version=`$DOT -V 2>&1|$GREP -oP
'(?<=version\W)@<:@0-9.@:>@*(?=\W(.*))'`
+ dot_version=`$DOT -V 2>&1|$GREP -o ['[0-9]*\.[0-9]*\.[0-9]*']`
AS_VERSION_COMPARE([$dot_version], [2.26.0],
[AC_MSG_RESULT([no])
AC_MSG_ERROR([Graphviz dot $dot_version too old.
Graphviz 2.26+ required for documentation build. Install required graphviz
version or disable the documentation using --disable-documentation])],
--
1.7.9.5
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