Changes and fixes to allow compilation on MacOS X

Makefile

@@ -1,28 +1,34 @@
-BIN=../bin/
-LIB=../lib/
+BIN=./bin/
+LIB=./lib/
 ALL=${BIN}e3d
 
 all: ${ALL}
 
+clean:
+	rm -rf ${BIN} ${LIB}
+
 ifeq ($(shell uname),Linux)
 CCOPTS=-Wall -D_GNU_SOURCE -O -fPIC -g
 OPTS= ${CCOPTS}
 endif
 
 ifeq ($(shell uname),Darwin)
 CCOPTS= -fnested-functions
-OPTS=-L/opt/local/lib -I/opt/local/include ${CCOPTS}
+OPTS=-L/opt/local/lib -I/opt/local/include -I/usr/include/malloc ${CCOPTS}
 endif
 
 ${LIB}%.o: %.c e3d.h
-	-indent $<
+	#-indent $<
+	mkdir -p ${LIB}
 	cc -c -o $@ $< ${OPTS}
 
 ${BIN}%: %.c
-	-indent $<
+	#-indent $<
+	mkdir -p ${BIN}
 	cc -o $@ $< ${OPTS} -lpopt
 
 ${BIN}e3d: e3d.c ${LIB}e3d-common.o ${LIB}e3d-stl.o ${LIB}e3d-slice.o ${LIB}e3d-fill.o ${LIB}e3d-gcode.o ${LIB}e3d-svg.o ${LIB}poly.o
-	-indent $<
+	#-indent $<
+	mkdir -p ${BIN}
 	cc -o $@ $< ${OPTS} -lpopt -lm ${LIB}e3d-common.o ${LIB}e3d-stl.o ${LIB}e3d-slice.o ${LIB}e3d-fill.o ${LIB}e3d-gcode.o ${LIB}e3d-svg.o ${LIB}poly.o