diff --git a/docker-builder-data/build/script/packet/png-1.6.26.files/libpng.pc.in.patch b/docker-builder-data/build/script/packet/png-1.6.26.files/libpng.pc.in.patch
new file mode 100644
index 0000000..dea9349
--- /dev/null
+++ b/docker-builder-data/build/script/packet/png-1.6.26.files/libpng.pc.in.patch
@@ -0,0 +1,2 @@
+8a9
+> Requires: zlib
diff --git a/docker-builder-data/build/script/packet/png-1.6.26.sh b/docker-builder-data/build/script/packet/png-1.6.26.sh
index e31de86..abc7ee9 100644
--- a/docker-builder-data/build/script/packet/png-1.6.26.sh
+++ b/docker-builder-data/build/script/packet/png-1.6.26.sh
@@ -5,3 +5,7 @@ PK_ARCHIVE="$PK_DIRNAME.tar.gz"
 PK_URL="http://download.sourceforge.net/libpng/$PK_ARCHIVE"
 
 source $INCLUDE_SCRIPT_DIR/inc-pkall-default.sh
+
+pkhook_prebuild() {
+    pkhelper_patch . libpng.pc.in
+}