Base path can be set through environment var EPICS_MBA_BASE.

src/makeBaseApp/makeBaseApp.pl

@@ -173,6 +173,8 @@ sub get_commandline_opts { #no args
     } elsif ($release{"EPICS_BASE"}) { # second choice is configure/RELEASE
 	$epics_base = UnixPath($release{"EPICS_BASE"});
 	$epics_base =~s|^\$\(TOP\)/||;
+    } elsif ($ENV{EPICS_MBA_BASE}) { # third choice is env var EPICS_MBA_BASE
+        $epics_base = UnixPath($ENV{EPICS_MBA_BASE});
     } elsif ($command =~ m|/bin/|) { # assume script was run with full path to base
 	$epics_base = $command;
 	$epics_base =~ s|^(.*)/bin/.*makeBaseApp.*|$1|;
@@ -436,7 +438,8 @@ EOF
           If arch is not specified, you will be prompted
  -b base  Set the location of EPICS base (full path)
           If not specified, base path is taken from configure/RELEASE
-          If configure does not exist, base path is taken from command
+          If configure does not exist, from environment
+          If not found in environment, from makeBaseApp.pl location
  -d       Enable debug messages
  -i       Specifies that ioc boot directories will be generated
  -l       List valid application types for this installation
@@ -454,6 +457,7 @@ EOF
 Environment:
 EPICS_MBA_DEF_APP_TYPE  Application type you want to use as default
 EPICS_MBA_TEMPLATE_TOP  Template top directory
+EPICS_MBA_BASE          Location of EPICS base
 
 Example: Create exampleApp 
 

src/makeBaseExt/makeBaseExt.pl

@@ -124,6 +124,8 @@ sub get_commandline_opts { #no args
 	    s/EPICS_BASE\s*=\s*// and $epics_base = UnixPath($_), break;
 	}
 	close IN;
+    } elsif ($ENV{EPICS_MBA_BASE}) { # third choice is env var EPICS_MBA_BASE
+        $epics_base = UnixPath($ENV{EPICS_MBA_BASE});
     } elsif ($command =~ m|/bin/|) { # assume script was called with full path to base
 	$epics_base = $command;
 	$epics_base =~ s|(/.*)/bin/.*makeBaseExt.*|$1|;
@@ -262,12 +264,14 @@ where
 	  If this is specified the other options are not used
  -b base  Set the location of EPICS base (full path)
           If not specified, base path is taken from configure/RELEASE
-          If configure does not exist, base path is taken from command
+          If configure does not exist, from environment
+          If not found in environment, from makeBaseApp.pl location
  -d       Verbose output (useful for debugging)
 
 Environment:
 EPICS_MBE_DEF_EXT_TYPE  Ext type you want to use as default
 EPICS_MBE_TEMPLATE_TOP  Template top directory
+EPICS_MBA_BASE          Location of EPICS base
 
 Example: Create example extension