# This patch prevents libzip's build system from trying to look for zlib, bzip2, lzma and zstd since Meson already handles that.

diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -196,68 +196,21 @@ check_c_source_compiles("
 int foo(char * _Nullable bar);
 int main(int argc, char *argv[]) { }" HAVE_NULLABLE)
 
-test_big_endian(WORDS_BIGENDIAN)
-
-find_package(ZLIB 1.1.2 REQUIRED)
-# so developers on systems where zlib is named differently (Windows, sometimes)
-# can override the name used in the pkg-config file
-if (NOT ZLIB_LINK_LIBRARY_NAME)
-  set(ZLIB_LINK_LIBRARY_NAME "z")
-
-  # Get the correct name in common cases
-  list(LENGTH ZLIB_LIBRARIES N_ZLIB_LIBRARIES)
-  if(N_ZLIB_LIBRARIES EQUAL 1)
-    set(ZLIB_FILENAME ${ZLIB_LIBRARIES})
-  elseif(N_ZLIB_LIBRARIES EQUAL 4)
-    # ZLIB_LIBRARIES might have the target_link_library() format like
-    # "optimized;path/to/zlib.lib;debug;path/to/zlibd.lib". Use the 'optimized'
-    # case unless we know we are in a Debug build.
-    if(CMAKE_BUILD_TYPE STREQUAL "Debug")
-      list(FIND ZLIB_LIBRARIES "debug" ZLIB_LIBRARIES_INDEX_OF_CONFIG)
-    else()
-      list(FIND ZLIB_LIBRARIES "optimized" ZLIB_LIBRARIES_INDEX_OF_CONFIG)
-    endif()
-    if(ZLIB_LIBRARIES_INDEX_OF_CONFIG GREATER_EQUAL 0)
-      math(EXPR ZLIB_FILENAME_INDEX "${ZLIB_LIBRARIES_INDEX_OF_CONFIG}+1")
-      list(GET ZLIB_LIBRARIES ${ZLIB_FILENAME_INDEX} ZLIB_FILENAME)
-    endif()
-  endif()
-  if(ZLIB_FILENAME)
-    get_filename_component(ZLIB_FILENAME ${ZLIB_FILENAME} NAME_WE)
-    string(REGEX REPLACE "^lib" "" ZLIB_LINK_LIBRARY_NAME ${ZLIB_FILENAME})
-  endif()
-endif(NOT ZLIB_LINK_LIBRARY_NAME)
+string(TOLOWER ${CMAKE_SYSTEM_NAME} SYSTEM_LOWER)
+if(NOT SYSTEM_LOWER STREQUAL "emscripten")
+    test_big_endian(WORDS_BIGENDIAN)
+endif()
 
 if(ENABLE_BZIP2)
-  find_package(BZip2)
-  if(BZIP2_FOUND)
     set(HAVE_LIBBZ2 1)
-  else()
-    message(WARNING "-- bzip2 library not found; bzip2 support disabled")
-  endif(BZIP2_FOUND)
 endif(ENABLE_BZIP2)
 
 if(ENABLE_LZMA)
-  find_package(LibLZMA 5.2)
-  if(LIBLZMA_FOUND)
     set(HAVE_LIBLZMA 1)
-  else()
-    message(WARNING "-- lzma library not found; lzma/xz support disabled")
-  endif(LIBLZMA_FOUND)
 endif(ENABLE_LZMA)
 
 if(ENABLE_ZSTD)
-  find_package(zstd 1.4.0)
-  if(zstd_FOUND)
     set(HAVE_LIBZSTD 1)
-    if(TARGET zstd::libzstd_shared AND BUILD_SHARED_LIBS)
-      set(zstd_TARGET zstd::libzstd_shared)
-    else()
-      set(zstd_TARGET zstd::libzstd_static)
-    endif()
-  else()
-    message(WARNING "-- zstd library not found; zstandard support disabled")
-  endif(zstd_FOUND)
 endif(ENABLE_ZSTD)
 
 if (COMMONCRYPTO_FOUND)
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -140,17 +140,14 @@ endif(WIN32)
 
 if(HAVE_LIBBZ2)
   target_sources(zip PRIVATE zip_algorithm_bzip2.c)
-  target_link_libraries(zip PRIVATE BZip2::BZip2)
 endif()
 
 if(HAVE_LIBLZMA)
   target_sources(zip PRIVATE zip_algorithm_xz.c)
-  target_link_libraries(zip PRIVATE LibLZMA::LibLZMA)
 endif()
 
 if(HAVE_LIBZSTD)
   target_sources(zip PRIVATE zip_algorithm_zstd.c)
-  target_link_libraries(zip PRIVATE ${zstd_TARGET})
 endif()
 
 if(HAVE_COMMONCRYPTO)
@@ -178,7 +175,6 @@ if(SHARED_LIB_VERSIONNING)
   set_target_properties(zip PROPERTIES VERSION 5.5 SOVERSION 5 MACHO_CURRENT_VERSION 6.5 MACHO_COMPATIBILITY_VERSION 6)
 endif()
 
-target_link_libraries(zip PRIVATE ZLIB::ZLIB)
 target_include_directories(zip
   PUBLIC
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/lib>
diff --git a/lib/compat.h b/lib/compat.h
--- a/lib/compat.h
+++ b/lib/compat.h
@@ -154,7 +154,8 @@ typedef off_t zip_off_t;
 #define ZIP_OFF_MAX ZIP_INT16_MAX
 #define ZIP_OFF_MIN ZIP_INT16_MIN
 #else
-#error unsupported size of off_t
+#define ZIP_OFF_MAX ZIP_INT64_MAX
+#define ZIP_OFF_MIN ZIP_INT64_MIN
 #endif
 
 #define ZIP_FSEEK_MAX ZIP_OFF_MAX
diff --git a/lib/zip_algorithm_bzip2.c b/lib/zip_algorithm_bzip2.c
--- a/lib/zip_algorithm_bzip2.c
+++ b/lib/zip_algorithm_bzip2.c
@@ -33,7 +33,7 @@
 
 #include "zipint.h"
 
-#include <bzlib.h>
+#include "../../bzip2/bzlib.h"
 #include <limits.h>
 #include <stdlib.h>
 
diff --git a/lib/zip_algorithm_deflate.c b/lib/zip_algorithm_deflate.c
--- a/lib/zip_algorithm_deflate.c
+++ b/lib/zip_algorithm_deflate.c
@@ -35,7 +35,7 @@
 
 #include <limits.h>
 #include <stdlib.h>
-#include <zlib.h>
+#include "../../zlib/zlib.h"
 
 struct ctx {
     zip_error_t *error;
diff --git a/lib/zip_algorithm_xz.c b/lib/zip_algorithm_xz.c
--- a/lib/zip_algorithm_xz.c
+++ b/lib/zip_algorithm_xz.c
@@ -35,9 +35,9 @@
 #include "zipint.h"
 
 #include <limits.h>
-#include <lzma.h>
+#include "../../liblzma/src/liblzma/api/lzma.h"
 #include <stdlib.h>
-#include <zlib.h>
+#include "../../zlib/zlib.h"
 
 enum header_state { INCOMPLETE, OUTPUT, DONE };
 
diff --git a/lib/zip_algorithm_zstd.c b/lib/zip_algorithm_zstd.c
--- a/lib/zip_algorithm_zstd.c
+++ b/lib/zip_algorithm_zstd.c
@@ -34,8 +34,8 @@
 #include "zipint.h"
 
 #include <stdlib.h>
-#include <zstd.h>
-#include <zstd_errors.h>
+#include "../../zstd/lib/zstd.h"
+#include "../../zstd/lib/zstd_errors.h"
 
 struct ctx {
     zip_error_t *error;
diff --git a/lib/zip_dirent.c b/lib/zip_dirent.c
--- a/lib/zip_dirent.c
+++ b/lib/zip_dirent.c
@@ -37,7 +37,7 @@
 #include <string.h>
 #include <sys/types.h>
 #include <time.h>
-#include <zlib.h>
+#include "../../zlib/zlib.h"
 
 #include "zipint.h"
 
diff --git a/lib/zip_error_strerror.c b/lib/zip_error_strerror.c
--- a/lib/zip_error_strerror.c
+++ b/lib/zip_error_strerror.c
@@ -35,7 +35,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <zlib.h>
+#include "../../zlib/zlib.h"
 
 #include "zipint.h"
 
diff --git a/lib/zip_io_util.c b/lib/zip_io_util.c
--- a/lib/zip_io_util.c
+++ b/lib/zip_io_util.c
@@ -34,7 +34,7 @@
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
-#include <zlib.h>
+#include "../../zlib/zlib.h"
 
 #include "zipint.h"
 
diff --git a/lib/zip_pkware.c b/lib/zip_pkware.c
--- a/lib/zip_pkware.c
+++ b/lib/zip_pkware.c
@@ -33,7 +33,7 @@
 
 
 #include <stdlib.h>
-#include <zlib.h>
+#include "../../zlib/zlib.h"
 
 #include "zipint.h"
 
diff --git a/lib/zip_source_crc.c b/lib/zip_source_crc.c
--- a/lib/zip_source_crc.c
+++ b/lib/zip_source_crc.c
@@ -34,7 +34,7 @@
 
 #include <limits.h>
 #include <stdlib.h>
-#include <zlib.h>
+#include "../../zlib/zlib.h"
 
 #include "zipint.h"
 
diff --git a/lib/zip_string.c b/lib/zip_string.c
--- a/lib/zip_string.c
+++ b/lib/zip_string.c
@@ -34,7 +34,7 @@
 
 #include <stdlib.h>
 #include <string.h>
-#include <zlib.h>
+#include "../../zlib/zlib.h"
 
 #include "zipint.h"
 
diff --git a/src/zipcmp.c b/src/zipcmp.c
--- a/src/zipcmp.c
+++ b/src/zipcmp.c
@@ -45,7 +45,7 @@
 #ifdef HAVE_FTS_H
 #include <fts.h>
 #endif
-#include <zlib.h>
+#include "../../zlib/zlib.h"
 
 #ifndef HAVE_GETOPT
 #include "getopt.h"