Index: building/Linux/build_package.sh
===================================================================
--- building/Linux/build_package.sh	(revision 4ff8483e5fcc7c4af79a41895486a9b8c4bcf018)
+++ building/Linux/build_package.sh	(revision 2a0a3cd4b667a6e3787b28f9ea896db92f347225)
@@ -17,5 +17,5 @@
 
 PACKAGE_DIR=$BUILD_DIR/../../../OfficialTolArchiveNetwork/$package
-if ![ -f "$PACKAGE_DIR/CMakeLists.txt" ]; then 
+if ! [ -f "$PACKAGE_DIR/CMakeLists.txt" ]; then 
   if [ -d "$PACKAGE_DIR" ]; then 
     echo "(!) Cannot find the CMakeLists.txt"