--- SRC/Makefile.orig
+++ SRC/Makefile
@@ -37,7 +37,7 @@ ARCHIVE   = ${PROJDIR}/ARCHIVE
 WARNINGS = -Wall -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes
 # WARNINGS = -Wunused -Wswitch -Wformat -Wreturn-type -Wimplicit -Wmissing-prototypes -Wmissing-declarations
 
-DEFINES   = 
+DEFINES   = -D_GNU_SOURCE 
 
 # LINUX system
 OPTISPLUS = 
@@ -46,24 +46,23 @@ INC       = -I/usr/include
 COMPILER  = -DGCC=1
 
 # Set OPTIS to the following values
-OPTIS = $(OPTISPLUS) -O2 -fforce-addr -finline-functions -fno-function-cse \
-	-fkeep-inline-functions
+OPTIS = $(OPTISPLUS) -O2
 
 ifeq ($(COMPILE_OPTION),DEBUG)
   # compile for debugging
-  COMPILE  = gcc -fsigned-char -DDEBUG -ansi -g -c ${WARNINGS} -I${SRC} -I${INC} ${COMPILER} ${SYS} ${DEFINES}
+  COMPILE  = gcc -DDEBUG -std=gnu99 -g -c $(OPTIS) ${WARNINGS} -I${SRC} -I${INC} ${COMPILER} ${SYS} ${DEFINES}
   LINK	   = gcc -g
 endif
 
 ifeq ($(COMPILE_OPTION),OPTIMIZE)
   # compile with all optimizations
-  COMPILE  = gcc -fsigned-char -ansi -c $(OPTIS) $(WARNINGS) -I${SRC} -I${INC} ${COMPILER} ${SYS} ${DEFINES}
-  LINK	   = gcc -O -s
+  COMPILE  = gcc -std=gnu99  -c $(OPTIS) $(WARNINGS) -I${SRC} -I${INC} ${COMPILER} ${SYS} ${DEFINES}
+  LINK	   = gcc
 endif
 
 ifeq ($(COMPILE_OPTION),PROFILE)
   # compile for use with "gprof"
-  COMPILE  = gcc -fsigned-char -ansi -pg -c ${WARNINGS} -I${SRC} -I${INC} ${COMPILER} ${SYS} ${DEFINES}
+  COMPILE  = gcc -ansi -pg -c ${WARNINGS} -I${SRC} -I${INC} ${COMPILER} ${SYS} ${DEFINES}
   LINK	   = gcc -pg
 endif