The format plug-ins need libSystem to compile too

src/format/Makefile

@@ -5,8 +5,8 @@ LIBDIR	= $(PREFIX)/lib
 CC	= cc
 CPPFLAGSF= -I ../../include
 CPPFLAGS=
-CFLAGSF	= -W -Wall -fPIC
-CFLAGS	= -g
+CFLAGSF	= -W `pkg-config --cflags libSystem`
+CFLAGS	= -Wall -g -O2 -fPIC
 AR	= ar -rc
 RANLIB	= ranlib
 LD	= $(CC) -shared

src/format/project.conf

@@ -1,7 +1,7 @@
 targets=dex,elf,flat,java,pe
 cppflags_force=-I ../../include
-cflags_force=-W -Wall -fPIC
-cflags=-g
+cflags_force=-W `pkg-config --cflags libSystem`
+cflags=-Wall -g -O2 -fPIC
 dist=Makefile
 
 [dex]