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-rw-r--r--pkgs/tools/text/sgml/opensp/setup-hook.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/text/sgml/opensp/setup-hook.sh b/pkgs/tools/text/sgml/opensp/setup-hook.sh
index 753a3ea64287..5bace3c66889 100644
--- a/pkgs/tools/text/sgml/opensp/setup-hook.sh
+++ b/pkgs/tools/text/sgml/opensp/setup-hook.sh
@@ -6,7 +6,7 @@ addSGMLCatalogs () {
       fi
 }
 
-if test -z "$sgmlHookDone"; then
+if test -z "${sgmlHookDone-}"; then
     sgmlHookDone=1
 
     # Set http_proxy and ftp_proxy to a invalid host to prevent