Set cmake minimum version in a centralized place

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

modules/TDEMacros.cmake

@@ -83,7 +83,6 @@ include( CheckCXXSourceCompiles )
 include( CheckLinkerFlag OPTIONAL )
 include( CheckSymbolExists )
 include( CheckTypeSize )
-include( TDEVersion )
 
 
 #################################################

modules/TDEVersion.cmake

@@ -9,6 +9,11 @@
 #
 #################################################
 
+# Centralized place where to set the minimum cmake version required in TDE
+
+set( TDE_CMAKE_MINIMUM_VERSION 3.5 )
+
+
 #################################################
 #####
 ##### tde_set_project_version
@@ -21,7 +26,7 @@ macro( tde_set_project_version )
 
   if( EXISTS ${CMAKE_SOURCE_DIR}/.tdescminfo )
     file( STRINGS ${CMAKE_SOURCE_DIR}/.tdescminfo VERSION_STRING REGEX "^Version:.+$" )
-    string( REGEX REPLACE "^Version: (R[0-9]+\.[0-9]+\.[0-9]+.*)$" "\\1" VERSION "${VERSION_STRING}" )
+    string( REGEX REPLACE "^Version: (R[0-9]+\\.[0-9]+\\.[0-9]+.*)$" "\\1" VERSION "${VERSION_STRING}" )
   endif()
 
   if( NOT VERSION )