--- Makefile.orig	2015-01-11 16:17:07 UTC
+++ Makefile
@@ -17,7 +17,7 @@ USE_BPGVIEW=y
 # Enable for compilation on MacOS X
 #CONFIG_APPLE=y
 # Installation prefix
-prefix=/usr/local
+prefix=${DESTDIR}${PREFIX}
 
 
 #################################
@@ -31,19 +31,20 @@ CROSS_PREFIX:=
 EXE:=
 endif
 
-CC=$(CROSS_PREFIX)gcc
-CXX=$(CROSS_PREFIX)g++
-AR=$(CROSS_PREFIX)ar
+CC?=$(CROSS_PREFIX)gcc
+CXX?=$(CROSS_PREFIX)g++
+AR?=$(CROSS_PREFIX)ar
+LD?=$(CROSS_PREFIX)ld
 EMCC=emcc
 
 PWD:=$(shell pwd)
 
-CFLAGS:=-Os -Wall -MMD -fno-asynchronous-unwind-tables -fdata-sections -ffunction-sections -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -fomit-frame-pointer
-CFLAGS+=-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_REENTRANT
-CFLAGS+=-I.
-CFLAGS+=-DCONFIG_BPG_VERSION=\"$(shell cat VERSION)\"
+CFLAGS_DIST:=-Os -Wall -MMD -fno-asynchronous-unwind-tables -fdata-sections -ffunction-sections -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -fomit-frame-pointer 
+CFLAGS_DIST+=-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_REENTRANT
+CFLAGS_DIST+=-I.
+CFLAGS_DIST+=-DCONFIG_BPG_VERSION=\"$(shell cat VERSION)\"
 ifdef USE_JCTVC_HIGH_BIT_DEPTH
-CFLAGS+=-DRExt__HIGH_BIT_DEPTH_SUPPORT
+CFLAGS_DIST+=-DRExt__HIGH_BIT_DEPTH_SUPPORT
 endif
 
 # Emscriptem config
@@ -53,14 +54,17 @@ EMLDFLAGS+=-s NO_FILESYSTEM=1 -s NO_BROW
 EMLDFLAGS+=-O3 --memory-init-file 0 --closure 1 --post-js post.js
 EMCFLAGS:=$(CFLAGS)
 
-LDFLAGS=-g
+LDFLAGS_DIST=-g
 ifdef CONFIG_APPLE
-LDFLAGS+=-Wl,-dead_strip
+LDFLAGS_DIST+=-Wl,-dead_strip
 else
-LDFLAGS+=-Wl,--gc-sections
+LDFLAGS_DIST+=-Wl,--gc-sections
 endif
-CFLAGS+=-g
-CXXFLAGS=$(CFLAGS)
+CFLAGS_DIST+=-g
+
+CFLAGS:=${CFLAGS_DIST} ${CFLAGS}
+LDFLAGS:=${LDFLAGS_DIST} ${LDFLAGS}
+CXXFLAGS=${CFLAGS}
 
 PROGS=bpgdec$(EXE) bpgenc$(EXE)
 ifdef USE_BPGVIEW
@@ -70,7 +74,7 @@ ifdef USE_EMCC
 PROGS+=bpgdec.js bpgdec8.js bpgdec8a.js
 endif
 
-all: $(PROGS)
+all: libbpg.a libbpg.so $(PROGS)
 
 LIBBPG_OBJS:=$(addprefix libavcodec/, \
 hevc_cabac.o  hevc_filter.o  hevc.o         hevcpred.o  hevc_refs.o\
@@ -158,6 +162,9 @@ bpgenc.o: CFLAGS+=-Wno-unused-but-set-va
 libbpg.a: $(LIBBPG_OBJS) 
 	$(AR) rcs $@ $^
 
+libbpg.so: $(LIBBPG_OBJS) 
+	$(CC) $(LDFLAGS) -shared -o $@ $^
+
 bpgdec$(EXE): bpgdec.o libbpg.a
 	$(CC) $(LDFLAGS) -o $@ $^ $(BPGDEC_LIBS)