Fix more failing searches with _ROOT variables set

(cherry picked from commit fc2a38f0cd7ec186f479b71ba63c23cb5bc156d1)

CMakeModules/FindHelpers.cmake

@@ -273,9 +273,14 @@ MACRO(FIND_PACKAGE_HELPER NAME INCLUDE)
   ENDIF()
 
   # Append environment variables XXX_DIR
+  IF(DEFINED ENV{${_UPNAME}_DIR})
+    LIST(APPEND _LIBRARY_PATHS
+      $ENV{${_UPNAME}_DIR}/lib${LIB_SUFFIX})
+  ENDIF()
+  IF(DEFINED ENV{${_UPNAME_FIXED}_DIR})
     LIST(APPEND _LIBRARY_PATHS
-    $ENV{${_UPNAME}_DIR}/lib${LIB_SUFFIX}
       $ENV{${_UPNAME_FIXED}_DIR}/lib${LIB_SUFFIX})
+  ENDIF()
 
   IF(UNIX AND NOT DEFINED ENV{${_UPNAME_FIXED}_ROOT})
     SET(_UNIX_LIBRARY_PATHS)
@@ -322,6 +327,20 @@ MACRO(FIND_PACKAGE_HELPER NAME INCLUDE)
   LIST(REMOVE_DUPLICATES _DEBUG_LIBRARIES)
 
   # Search for release library
+  IF(DEFINED ENV{${_UPNAME_FIXED}_ROOT})
+    FIND_LIBRARY(${_UPNAME_FIXED}_LIBRARY_RELEASE
+      NAMES
+      ${_RELEASE_LIBRARIES}
+      HINTS ${PKG_${_NAME_FIXED}_LIBRARY_DIRS}
+      PATHS
+      ${_LIBRARY_PATHS}
+      ${_UNIX_LIBRARY_PATHS}
+      NO_CMAKE_PATH 
+      NO_CMAKE_SYSTEM_PATH
+      NO_CMAKE_ENVIRONMENT_PATH
+      NO_SYSTEM_ENVIRONMENT_PATH
+    )
+  ELSE()
     FIND_LIBRARY(${_UPNAME_FIXED}_LIBRARY_RELEASE
       NAMES
       ${_RELEASE_LIBRARIES}
@@ -331,6 +350,7 @@ MACRO(FIND_PACKAGE_HELPER NAME INCLUDE)
       ${_UNIX_LIBRARY_PATHS}
       NO_CMAKE_SYSTEM_PATH
     )
+  ENDIF()
 
   IF(_IS_VERBOSE)
     IF(${_UPNAME_FIXED}_LIBRARY_RELEASE)
@@ -341,6 +361,20 @@ MACRO(FIND_PACKAGE_HELPER NAME INCLUDE)
   ENDIF()
 
   # Search for debug library
+  IF(DEFINED ENV{${_UPNAME_FIXED}_ROOT})
+    FIND_LIBRARY(${_UPNAME_FIXED}_LIBRARY_DEBUG
+      NAMES
+      ${_DEBUG_LIBRARIES}
+      HINTS ${PKG_${_NAME_FIXED}_LIBRARY_DIRS}
+      PATHS
+      ${_LIBRARY_PATHS}
+      ${_UNIX_LIBRARY_PATHS}
+      NO_CMAKE_PATH 
+      NO_CMAKE_SYSTEM_PATH
+      NO_CMAKE_ENVIRONMENT_PATH
+      NO_SYSTEM_ENVIRONMENT_PATH
+    )
+  ELSE()
     FIND_LIBRARY(${_UPNAME_FIXED}_LIBRARY_DEBUG
       NAMES
       ${_DEBUG_LIBRARIES}
@@ -350,6 +384,7 @@ MACRO(FIND_PACKAGE_HELPER NAME INCLUDE)
       ${_UNIX_LIBRARY_PATHS}
       NO_CMAKE_SYSTEM_PATH
     )
+  ENDIF()
 
   IF(_IS_VERBOSE)
     IF(${_UPNAME_FIXED}_LIBRARY_DEBUG)