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-rw-r--r--configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index 55600d90b..4f00ff014 100644
--- a/configure.ac
+++ b/configure.ac
@@ -275,7 +275,7 @@ test "$prefix" = NONE && prefix=$ac_default_prefix
test "$exec_prefix" = NONE && exec_prefix='${prefix}'
for name in $ac_subst_vars; do
for _ in 1 2 3; do
- if printf '%s' "${name}" | egrep '^[[_[[:alpha:]]]][[_[[:alnum:]]]]*$'
+ if printf '%s' "${name}" | egrep '^[_[:alpha:]][_[:alnum:]]*$'
then
eval "${name}"="$(eval echo "\${${name}}")"
fi