[tools] Allow non redhat-based linux distrib.

Author: stdcm

tools/LoadOSFeatures.cmake

@@ -18,26 +18,28 @@ if(WIN32)
 else()
 
   if(NOT REDHAT_RELEASE)
-    logFatalError("** This environment is not RedHat based **")
+    logStatus("** This environment is not RedHat based **")
   endif()
 
-  if(${REDHAT_RELEASE} MATCHES "release 5.")
-    set(RHEL_TAG RHEL5)
-    loadMeta(NAME rhel5)
-  elseif(${REDHAT_RELEASE} MATCHES "release 6.")
-    set(RHEL_TAG RHEL6)
-    loadMeta(NAME rhel6)
-  elseif(${REDHAT_RELEASE} MATCHES "release 7.")
-    set(RHEL_TAG RHEL7)
-    loadMeta(NAME rhel7)
-  elseif(${REDHAT_RELEASE} MATCHES "release 8.")
-    set(RHEL_TAG RHEL8)
-    loadMeta(NAME rhel8)
-  elseif(${REDHAT_RELEASE} MATCHES "release 9.")
-    set(RHEL_TAG RHEL9)
-    loadMeta(NAME rhel9)  
-  else()
-    logFatalError("Cannot identify current RedHat release")
+  if (REDHAT_RELEASE)
+    if(${REDHAT_RELEASE} MATCHES "release 5.")
+      set(RHEL_TAG RHEL5)
+      loadMeta(NAME rhel5)
+    elseif(${REDHAT_RELEASE} MATCHES "release 6.")
+      set(RHEL_TAG RHEL6)
+      loadMeta(NAME rhel6)
+    elseif(${REDHAT_RELEASE} MATCHES "release 7.")
+      set(RHEL_TAG RHEL7)
+      loadMeta(NAME rhel7)
+    elseif(${REDHAT_RELEASE} MATCHES "release 8.")
+      set(RHEL_TAG RHEL8)
+      loadMeta(NAME rhel8)
+    elseif(${REDHAT_RELEASE} MATCHES "release 9.")
+      set(RHEL_TAG RHEL9)
+      loadMeta(NAME rhel9)  
+    else()
+      logFatalError("Cannot identify current RedHat release")
+    endif()
   endif()
 
 endif()