--- ./CMakeLists.txt.orig	2020-11-09 00:02:12 +0000
+++ ./CMakeLists.txt	2020-11-09 00:03:15 +0000
@@ -410,7 +410,9 @@
 INCLUDE(cpack_rpm)
 INCLUDE(cpack_deb)
 
-SET(PYTHON_SHEBANG "/usr/bin/env python" CACHE STRING "python shebang")
+IF(NOT DEFINED PYTHON_SHEBANG)
+  SET(PYTHON_SHEBANG "/usr/bin/env python" CACHE STRING "python shebang")
+ENDIF()
 MARK_AS_ADVANCED(PYTHON_SHEBANG)
 
 # Add storage engines and plugins.