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-rw-r--r--extensions/GNUmakefile.in4
1 files changed, 2 insertions, 2 deletions
diff --git a/extensions/GNUmakefile.in b/extensions/GNUmakefile.in
index 709366a1..7c479018 100644
--- a/extensions/GNUmakefile.in
+++ b/extensions/GNUmakefile.in
@@ -155,8 +155,8 @@ initext6.c: .initext6.dd
#
# Manual pages
#
-ex_matches = $(sort $(shell echo $(1) | grep -Eo '\b[a-z0-9]+\b'))
-ex_targets = $(sort $(shell echo $(1) | grep -Eo '\b[A-Z0-9]+\b'))
+ex_matches = $(sort $(shell echo $(1) | LC_ALL=POSIX grep -Eo '\b[[:alnum:]]+\b'))
+ex_targets = $(sort $(shell echo $(1) | LC_ALL=POSIX grep -Eo '\b[[:alnum:]]+\b'))
man_run = \
${AM_VERBOSE_GEN} \
for ext in $(1); do \