Add a new way to find python2 in cmake script.

CMake/findPython.cmake

@@ -42,6 +42,18 @@
 #  PYTHON_EXE: Python executable
 #  CYTHON_EXE: Cython executable
 
+function(check_py27 PYPATH)
+	message(STATUS PYPATH=${PYPATH})
+	if(EXISTS ${PYPATH})
+		execute_process(COMMAND ${PYPATH} "--version" OUTPUT_VARIABLE PY2_VER ERROR_VARIABLE PY2_VER2 RESULT_VARIABLE RES)
+#		message(STATUS PY2_VER=${PY2_VER} PY2_VER2=${PY2_VER2})
+		if(${RES} EQUAL 0 AND ("${PY2_VER}" MATCHES "Python 2\\.7\\..*" OR "${PY2_VER2}" MATCHES "Python 2\\.7\\..*") )
+			SET(PYTHON2_EXE ${PYPATH} PARENT_SCOPE)
+		else()
+			UNSET(PYTHON2_EXE)
+		endif()
+	endif()
+endfunction(check_py27)
 
 message(STATUS "------------------------------------------------")
 message(STATUS "------------ Looking for Python PATH -----------")
@@ -85,13 +97,13 @@ if(UNIX OR WIN32)
 			set(PYTHON2_EXE ${PYTHON_EXECUTABLE})
 		else()
 			string(REGEX REPLACE "(.*)/python.*" "\\1/python2" TMP_PYTHON2_EXE ${PYTHON3_EXE})
-			#message(STATUS "PYTHON3_EXE=${PYTHON3_EXE} "TMP_PYTHON2_EXE=${TMP_PYTHON2_EXE})
-			if(EXISTS ${TMP_PYTHON2_EXE})
-				execute_process(COMMAND ${TMP_PYTHON2_EXE} "--version" OUTPUT_VARIABLE PY2_VER ERROR_VARIABLE PY2_VER2 RESULT_VARIABLE RES)
-				#	message(STATUS PY2_VER=${PY2_VER} PY2_VER2=${PY2_VER2})
-				if(${RES} EQUAL 0 AND ("${PY2_VER}" MATCHES "Python 2\\.7\\..*" OR "${PY2_VER2}" MATCHES "Python 2\\.7\\..*") )
-					SET(PYTHON2_EXE ${TMP_PYTHON2_EXE})
-				endif()
+			# message(STATUS "PYTHON3_EXE=${PYTHON3_EXE} TMP_PYTHON2_EXE=${TMP_PYTHON2_EXE}")
+			check_py27(${TMP_PYTHON2_EXE})
+			# if py27 still not found use find_program
+			if(NOT PYTHON2_EXE)
+				find_program(TMP_PYTHON2_EXE_ python2)
+				check_py27(${TMP_PYTHON2_EXE_})
+				message(STATUS "TMP_PYTHON2=${PYTHON2_EXE}")
 			endif()
 		endif()
 		if(NOT PYTHON2_EXE)