diff --git a/build.zig.zon b/build.zig.zon
index 07fd011..1f3e940 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -5,8 +5,9 @@
     .minimum_zig_version = "0.15.2",
     .dependencies = .{
         .zlib_ng = .{
-            .url = "https://github.com/CalebQ42/zig-zlib-ng/archive/refs/tags/2.3.3.tar.gz",
-            .hash = "zlib_ng-2.3.3-2HYS4Bw_AADjgv7tkrqjjz2fVz5kRTvha8wN9LEcjYNp",
+            // .url = "https://github.com/CalebQ42/zig-zlib-ng/archive/refs/tags/2.3.3.tar.gz",
+            // .hash = "zlib_ng-2.3.3-2HYS4Bw_AADjgv7tkrqjjz2fVz5kRTvha8wN9LEcjYNp",
+            .path = "../zig-zlib-ng",
         },
     },
     .paths = .{
diff --git a/src/archive.zig b/src/archive.zig
index f053e0b..a6cc252 100644
--- a/src/archive.zig
+++ b/src/archive.zig
@@ -18,7 +18,7 @@ const OffsetFile = @import("util/offset_file.zig");
 const XattrTable = @import("xattr.zig");
 
 const config = if (builtin.is_test) .{
-    .use_c_libs = true,
+    .use_zig_decomp = builtin.link_libc != true,
     .allow_lzo = false,
 } else @import("config");
 
@@ -45,8 +45,8 @@ pub fn init(alloc: std.mem.Allocator, fil: File, offset: u64) !Archive {
         .lzma => Decomp.lzmaDecompress,
         .xz => Decomp.xzDecompress,
         .zstd => Decomp.zstdDecompress,
-        .lz4 => if (config.use_c_libs) Decomp.cLz4 else return error.Lz4Unsupported,
-        .lzo => if (config.use_c_libs and config.allow_lzo) Decomp.lzoDecompress else return error.LzoUnsupported,
+        .lz4 => if (!config.use_zig_decomp) Decomp.cLz4 else return error.Lz4Unsupported,
+        .lzo => if (!config.use_zig_decomp and config.allow_lzo) Decomp.lzoDecompress else return error.LzoUnsupported,
     };
     return .{
         .alloc = alloc,
diff --git a/src/decomp.zig b/src/decomp.zig
index 0928e09..de77c23 100644
--- a/src/decomp.zig
+++ b/src/decomp.zig
@@ -6,7 +6,7 @@ const Reader = std.Io.Reader;
 const builtin = @import("builtin");
 
 const config = if (builtin.is_test) .{
-    .use_c_libs = builtin.link_libc == true,
+    .use_zig_decomp = builtin.link_libc != true,
     .allow_lzo = false, // Change once LZO compilation is fixed
 } else @import("config");
 
@@ -31,7 +31,7 @@ pub const CompressionType = enum(u16) {
 
 pub const DecompFn = *const fn (alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize; // TODO: replace anyerror to definitive error types.
 
-pub const gzipDecompress = if (config.use_c_libs) cGzip else zigGzip;
+pub const gzipDecompress = if (!config.use_zig_decomp) cGzip else zigGzip;
 
 fn zigGzip(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
     var rdr: Reader = .fixed(in);
@@ -53,7 +53,7 @@ fn cGzip(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
     };
 }
 
-pub const lzmaDecompress = if (config.use_c_libs) cLzma else zigLzma;
+pub const lzmaDecompress = if (!config.use_zig_decomp) cLzma else zigLzma;
 
 fn zigLzma(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
     var rdr: Reader = .fixed(in);
@@ -90,7 +90,7 @@ fn cLzma(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
     };
 }
 
-// pub const lzoDecompress = if (config.use_c_libs) cLzo else zigLzo;
+// pub const lzoDecompress = if (!config.use_zig_decomp) cLzo else zigLzo;
 
 // fn zigLzo(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
 //     _ = alloc;
@@ -123,7 +123,7 @@ pub fn cLzo(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
     };
 }
 
-pub const xzDecompress = if (config.use_c_libs) cXz else zigXz;
+pub const xzDecompress = if (!config.use_zig_decomp) cXz else zigXz;
 
 fn zigXz(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
     var rdr: Reader = .fixed(in);
@@ -161,7 +161,7 @@ fn cXz(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
     };
 }
 
-// pub const lz4Decompress = if (config.use_c_libs) cLz4 else zigLz4;
+// pub const lz4Decompress = if (!config.use_zig_decomp) cLz4 else zigLz4;
 
 // fn zigLz4(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
 //     _ = alloc;
@@ -176,7 +176,7 @@ pub fn cLz4(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
     return error.Lz4DecompressFailed;
 }
 
-pub const zstdDecompress = if (config.use_c_libs) cZstd else zigZstd;
+pub const zstdDecompress = if (!config.use_zig_decomp) cZstd else zigZstd;
 
 pub fn zigZstd(alloc: std.mem.Allocator, in: []u8, out: []u8) anyerror!usize {
     var rdr: Reader = .fixed(in);