Test for >= gcc 4, and change to g99 -std=gnu99 for the compiler if it is found.
Change in the Makefile to check for gcc >= 4 and if found, set "CC = c99 --std=gnu99" so that it will compile under gcc 4
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Change in the Makefile to check for gcc >= 4 and if found, set "CC = c99 --std=gnu99" so that it will compile under gcc 4