Not the prettiest CMakeLists.txt, but it builds...

will want to bring over some options from the zstd Makefile (or decide
this is a terrible idea and bail out)

CMakeLists.txt

@@ -46,6 +46,7 @@ set (PROJECTS
 	src/third_party_lib/libcorrect
 	src/third_party_lib/libpopcnt
 	src/third_party_lib/wirehair
+	src/third_party_lib/zstd
 )
 
 include_directories(

src/third_party_lib/zstd/CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 2.8)
+project(zstd C)
+
+add_subdirectory(common)
+add_subdirectory(compress)
+add_subdirectory(decompress)
+
+set(zstd_obj_files $<TARGET_OBJECTS:zstd-common> $<TARGET_OBJECTS:zstd-compress> $<TARGET_OBJECTS:zstd-decompress>)
+
+add_library(zstd ${zstd_obj_files})
+

src/third_party_lib/zstd/common/CMakeLists.txt

@@ -0,0 +1,3 @@
+set(SRCFILES bitstream.h     compiler.h  debug.c  entropy_common.c  error_private.h   fse.h  mem.h   pool.h       threading.h  xxhash.h       zstd_errors.h
+  cpu.h       debug.h  error_private.c   fse_decompress.c  huf.h  pool.c  threading.c  xxhash.c     zstd_common.c  zstd_internal.h)
+add_library(zstd-common OBJECT ${SRCFILES})

src/third_party_lib/zstd/compress/CMakeLists.txt

@@ -0,0 +1,5 @@
+set(SRCFILES huf_compress.c            zstd_compress_literals.h    zstd_compress_superblock.h  zstd_fast.c  zstd_ldm.c         zstd_opt.c
+fse_compress.c  zstd_compress.c           zstd_compress_sequences.c   zstd_cwksp.h                zstd_fast.h  zstd_ldm.h         zstd_opt.h
+hist.c          zstd_compress_internal.h  zstd_compress_sequences.h   zstd_double_fast.c          zstd_lazy.c  zstdmt_compress.c
+hist.h          zstd_compress_literals.c  zstd_compress_superblock.c  zstd_double_fast.h          zstd_lazy.h  zstdmt_compress.h)
+add_library(zstd-compress OBJECT ${SRCFILES})

src/third_party_lib/zstd/decompress/CMakeLists.txt

@@ -0,0 +1,2 @@
+set(SRCFILES huf_decompress.c  zstd_ddict.c  zstd_ddict.h  zstd_decompress_block.c  zstd_decompress_block.h  zstd_decompress.c  zstd_decompress_internal.h)
+add_library(zstd-decompress OBJECT ${SRCFILES})