Link against libc for iconv, find openjpeg header with pkgconf.

Signed-off-by: yzrh <yzrh@noema.org>

README.md

@@ -12,12 +12,12 @@ any failures with a sample that can reproduce the behaviour.
 Dependency
 ----------
 
-1.  OpenSSL
-2.  libiconv
-3.  zlib
-4.  jbig2dec
-5.  libjpeg-turbo
-6.  openjpeg
+1.  libcrypto (OpenSSL)
+2.  zlib
+3.  jbig2dec
+4.  libjpeg-turbo
+5.  openjpeg
+6.  pkgconf
 
 Usage
 =====

src/Makefile

@@ -16,11 +16,16 @@ obj = ${src:.c=.o}
 PREFIX = /usr/local
 
 CFLAGS = -O2 -pipe -flto -Wall -Wextra
-LDFLAGS = -Wl,-O2 -lcrypto -liconv -lz -ljbig2dec -ljpeg -lopenjp2 -Wl,--as-needed
+LDFLAGS = -Wl,-O2 -lcrypto -lz -ljbig2dec -ljpeg -lopenjp2 -Wl,--as-needed
 
 CFLAGS += -I/usr/local/include
 LDFLAGS += -L/usr/local/lib
 
+OPENJPEG_CFLAGS != pkgconf --cflags libopenjp2
+
+CFLAGS += ${OPENJPEG_CFLAGS}
+CFLAGS += -DLIBICONV_PLUG
+
 all: ${obj} ${inc}
 	${CC} ${LDFLAGS} -o melon ${obj}
 

src/jp2.c

@@ -6,11 +6,7 @@
 
 #include <string.h>
 
-#ifdef __linux__
 #include <openjpeg.h>
-#else
-#include <openjpeg-2.5/openjpeg.h>
-#endif
 
 typedef struct _stream_user_data {
 	OPJ_SIZE_T pos;