fix for warning:
src/Makefile.am:122: warning: eval $(call thrift_template,.,$(srcdir: non-POSIX variable name
src/Makefile.am:122: (probably a GNU make extension)
src/Makefile.am:123: warning: eval $(call thrift_template,.,$(srcdir: non-POSIX variable name
src/Makefile.am:123: (probably a GNU make extension)
src/Makefile.am:126: warning: eval $(call thrift_template,.,$(smc_home: non-POSIX variable name
src/Makefile.am:126: (probably a GNU make extension)