diff --git a/fuzzers/inprocess/libfuzzer_libpng/Justfile b/fuzzers/inprocess/libfuzzer_libpng/Justfile
index 300ebd626a..10c6446ed0 100644
--- a/fuzzers/inprocess/libfuzzer_libpng/Justfile
+++ b/fuzzers/inprocess/libfuzzer_libpng/Justfile
@@ -1,117 +1,40 @@
+import "../../../just/libafl-cc-libpng.just"
+
 FUZZER_NAME := 'fuzzer_libpng'
-PROJECT_DIR := absolute_path(".")
-PROFILE := env("PROFILE", "release")
-PROFILE_DIR := if PROFILE == "release" { "release" } else if PROFILE == "dev" { "debug" } else { "debug" }
-CARGO_TARGET_DIR := env("CARGO_TARGET_DIR", "target")
-FUZZER := PROJECT_DIR / CARGO_TARGET_DIR / PROFILE_DIR / FUZZER_NAME
-LIBAFL_CC := PROJECT_DIR / CARGO_TARGET_DIR / PROFILE_DIR / "libafl_cc"
-LIBAFL_CXX := PROJECT_DIR / CARGO_TARGET_DIR / PROFILE_DIR / "libafl_cxx"
 
+[unix]
+cc feat:
+    cargo build --profile {{PROFILE}} --features="{{feat}}"
 
-alias cc := cxx
+[unix]
+cxx feat:
+    cargo build --profile {{PROFILE}} --features="{{feat}}"
 
-[linux]
-[macos]
-libpng:
-    #!/bin/bash
-    if [ ! -f v1.6.37.tar.gz ]; then
-        wget https://github.com/glennrp/libpng/archive/refs/tags/v1.6.37.tar.gz
-    fi
-    tar -xvf v1.6.37.tar.gz
+[unix]
+lib feat: (libpng feat) (cxx feat)
 
-[windows]
-libpng:
-    echo "Unsupported on this platform"
+# Feat is either nothing or "crash"
+[unix]
+fuzzer feat="": (lib feat) (cxx feat)
+    {{LIBAFL_CXX}} {{PROJECT_DIR}}/harness.cc \
+        "{{LIBPNG_BUILD}}/.libs/libpng16.a" \
+        "{{ZLIB_BUILD}}/libz.a" \
+        -I"{{LIBPNG_INCLUDE}}" \
+        -I"{{LIBPNG_BUILD}}" \
+        -I"{{ZLIB_INCLUDE}}" \
+        -L"{{ZLIB_LIB}}" \
+        -o {{FUZZER_NAME}} \
+        -lm -lz
 
-[linux]
-[macos]
-cxx:
-    cargo build --profile {{PROFILE}}
-
-[windows]
-cxx:
-    echo "Unsupported on this platform"
-
-[linux]
-[macos]
-crash_cxx:
-    cargo build --profile {{PROFILE}} --features=crash
-
-[windows]
-crash_cxx:
-    echo "Unsupported on this platform"
-
-[linux]
-[macos]
-lib: libpng cxx
-    #!/bin/bash
-    cd libpng-1.6.37 && ./configure --enable-shared=no --with-pic=yes --enable-hardware-optimizations=yes
-    cd {{PROJECT_DIR}}
-    make -C libpng-1.6.37 CC="{{LIBAFL_CC}}" CXX="{{LIBAFL_CXX}}"
-
-[windows]
-lib:
-    echo "Unsupported on this platform"
-
-[linux]
-[macos]
-crash_lib: libpng crash_cxx
-    #!/bin/bash
-    cd libpng-1.6.37 && ./configure --enable-shared=no --with-pic=yes --enable-hardware-optimizations=yes
-    cd {{PROJECT_DIR}}
-    make -C libpng-1.6.37 CC="{{LIBAFL_CC}}" CXX="{{LIBAFL_CXX}}"
-
-[windows]
-crash_lib:
-    echo "Unsupported on this platform"
-
-[linux]
-[macos]
-fuzzer: lib cxx
-    pwd
-    {{LIBAFL_CXX}} {{PROJECT_DIR}}/harness.cc {{PROJECT_DIR}}/libpng-1.6.37/.libs/libpng16.a -I {{PROJECT_DIR}}/libpng-1.6.37/ -o {{FUZZER_NAME}} -lm -lz
-
-[windows]
-fuzzer:
-    echo "Unsupported on this platform"
-
-[linux]
-[macos]
-crash_fuzzer: crash_lib crash_cxx
-    {{LIBAFL_CXX}} {{PROJECT_DIR}}/harness.cc {{PROJECT_DIR}}/libpng-1.6.37/.libs/libpng16.a -I {{PROJECT_DIR}}/libpng-1.6.37/ -o {{FUZZER_NAME}} -lm -lz
-
-[windows]
-crash_fuzzer:
-    echo "Unsupported on this platform"
-
-
-[linux]
-[macos]
-run: fuzzer
+# Feat is either nothing or "crash"
+[unix]
+run feat="": (fuzzer feat)
     #!/bin/bash
     ./{{FUZZER_NAME}} &
     sleep 0.2
     ./{{FUZZER_NAME}} 2>/dev/null
 
-[windows]
-run: fuzzer
-    echo "Unsupported on this platform"
-
-[linux]
-[macos]
-crash: crash_fuzzer
-    #!/bin/bash
-    ./{{FUZZER_NAME}} &
-    sleep 0.2
-    ./{{FUZZER_NAME}} 2>/dev/null
-
-[windows]
-crash: fuzzer
-    echo "Unsupported on this platform"
-
-
-[linux]
-[macos]
+[unix]
 test: fuzzer
     #!/bin/bash
     rm -rf libafl_unix_shmem_server || true
@@ -125,12 +48,7 @@ test: fuzzer
         exit 1
     fi
 
-[windows]
-test: fuzzer
-    echo "Unsupported on this platform"
-
 clean:
     rm -rf {{FUZZER_NAME}}
     make -C libpng-1.6.37 clean || true
-    cargo clean
-
+    cargo clean
\ No newline at end of file
diff --git a/just/libafl-cc-libpng.just b/just/libafl-cc-libpng.just
new file mode 100644
index 0000000000..da253ef241
--- /dev/null
+++ b/just/libafl-cc-libpng.just
@@ -0,0 +1,60 @@
+import "libafl-cc.just"
+
+OPTIMIZATIONS := env("OPTIMIZATIONS", "yes")
+
+LIBPNG_ROOT :=  DEPS_DIR / "libpng-1.6.37"
+LIBPNG_BUILD := TARGET_DIR / "build-png"
+LIBPNG_INCLUDE := LIBPNG_ROOT
+
+ZLIB_ROOT := DEPS_DIR / "zlib-1.2.13"
+ZLIB_BUILD := TARGET_DIR / "build-zlib"
+ZLIB_INCLUDE := ZLIB_BUILD / "zlib" / "include"
+ZLIB_LIB := ZLIB_BUILD / "zlib" / "lib"
+
+DEPS_DIR := TARGET_DIR / "deps"
+
+[unix]
+target_dir:
+    mkdir -p {{ TARGET_DIR }}
+
+[unix]
+deps_dir:
+    mkdir -p {{ DEPS_DIR }}
+
+[unix]
+zlib_wget: deps_dir
+    wget -O "{{ DEPS_DIR }}/zlib-1.2.13.tar.gz" https://zlib.net/fossils/zlib-1.2.13.tar.gz
+
+    tar zxvf {{ DEPS_DIR }}/zlib-1.2.13.tar.gz -C {{ DEPS_DIR }}
+
+[unix]
+zlib feat: zlib_wget (cc feat)
+    rm -rf {{ ZLIB_BUILD }}
+    mkdir {{ ZLIB_BUILD }}
+
+    cd {{ ZLIB_BUILD }} && CC={{ LIBAFL_CC }} {{ ZLIB_ROOT }}/configure --prefix=./zlib
+
+    make -j -C {{ ZLIB_BUILD }} install
+
+[unix]
+libpng_wget: deps_dir
+    wget -O "{{ DEPS_DIR }}/v1.6.37.tar.gz" https://github.com/glennrp/libpng/archive/refs/tags/v1.6.37.tar.gz
+
+    tar -xvf "{{ DEPS_DIR }}/v1.6.37.tar.gz" -C {{ DEPS_DIR }}
+
+    rm -rf {{ LIBPNG_BUILD }}
+    mkdir {{ LIBPNG_BUILD }}
+
+[unix]
+libpng feat: (zlib feat) libpng_wget (cc feat)
+    cd {{ LIBPNG_BUILD }}/ && \
+        CC="{{LIBAFL_CC}}" \
+        CFLAGS="-I{{ ZLIB_INCLUDE }}" \
+        CPPFLAGS="-I{{ ZLIB_INCLUDE }}" \
+        LDFLAGS="-L{{ ZLIB_LIB }}" \
+        {{ DEPS_DIR }}/libpng-1.6.37/configure \
+            --enable-shared=no \
+            --with-pic=yes \
+            --enable-hardware-optimizations={{ OPTIMIZATIONS }}
+
+    make -j -C {{ LIBPNG_BUILD }}
diff --git a/just/libafl-cc.just b/just/libafl-cc.just
new file mode 100644
index 0000000000..9058c2aa5e
--- /dev/null
+++ b/just/libafl-cc.just
@@ -0,0 +1,4 @@
+import "libafl.just"
+
+LIBAFL_CC := BUILD_DIR / "libafl_cc"
+LIBAFL_CXX := BUILD_DIR / "libafl_cxx"
diff --git a/just/libafl-qemu-libpng.just b/just/libafl-qemu-libpng.just
index 6a23a5d645..e68a2cca23 100644
--- a/just/libafl-qemu-libpng.just
+++ b/just/libafl-qemu-libpng.just
@@ -79,6 +79,6 @@ libpng: arch_dir zlib libpng_wget
             --enable-shared=no \
             --with-pic=yes \
             --enable-hardware-optimizations={{ OPTIMIZATIONS }} \
-            --host={{ ARCH }} \
+            --host={{ ARCH }}
 
     make -j -C {{ TARGET_DIR }}/build-png/
\ No newline at end of file
diff --git a/just/libafl.just b/just/libafl.just
index 2bf9258c56..f11e5d1534 100644
--- a/just/libafl.just
+++ b/just/libafl.just
@@ -12,11 +12,13 @@
 #   - `FUZZER`: Executable path.
 
 PROFILE := env("PROFILE", "release")
+FUZZER_EXTENSION := if os_family() == "windows" { ".exe" } else { "" }
+FUZZER := BUILD_DIR / FUZZER_NAME + FUZZER_EXTENSION
+
+PROJECT_DIR := absolute_path(".")
 PROFILE_DIR := if PROFILE == "dev" { "debug" } else { "release" }
 TARGET_DIR := absolute_path(env("TARGET_DIR", "target"))
 BUILD_DIR := TARGET_DIR / PROFILE_DIR
-FUZZER_EXTENSION := if os_family() == "windows" { ".exe" } else { "" }
-FUZZER := BUILD_DIR / FUZZER_NAME + FUZZER_EXTENSION
 
 JUSTHASHES := ".justhashes"
 
diff --git a/libafl_targets/src/forkserver.c b/libafl_targets/src/forkserver.c
index e3f8f831b1..f5d16d4bc5 100644
--- a/libafl_targets/src/forkserver.c
+++ b/libafl_targets/src/forkserver.c
@@ -272,8 +272,7 @@ void __afl_start_forkserver(void) {
     uint32_t len = (__token_stop - __token_start), offset = 0;
 
     if (write(FORKSRV_FD + 1, &len, 4) != 4) {
-      write(2, "Error: could not send autotokens len\n",
-            strlen("Error: could not send autotokens len\n"));
+      fprintf(stderr, "Error: could not send autotokens len\n");
       _exit(1);
     }