CMake: doing proper string comparison in IF clause

diff --git a/SalomeCALCULATORConfig.cmake.in b/SalomeCALCULATORConfig.cmake.in
index ef6728e31421920e620183d692bdf6f4a9245bcf..29c9501ae929eeace4a45b6e2e840b566a8919d6 100644 (file)
--- a/SalomeCALCULATORConfig.cmake.in
+++ b/SalomeCALCULATORConfig.cmake.in
@@ -66,7 +66,7 @@ MATH(EXPR _range "${_list_len}-1")
 FOREACH(_p RANGE ${_range})  
   LIST(GET _PREREQ            ${_p} _pkg    )
   LIST(GET _PREREQ_CONFIG_DIR ${_p} _pkg_dir)
-  IF(_pkg_dir)
+  IF(NOT _pkg_dir STREQUAL "")
      MESSAGE(STATUS "===> Reloading targets from ${_pkg} ...")
      FIND_PACKAGE(${_pkg} REQUIRED NO_MODULE 
           PATHS "${_pkg_dir}"