diff --git a/sys-libs/zlib/patches/zlib-1.2.11.patchset b/sys-libs/zlib/patches/zlib-1.2.11.patchset
deleted file mode 100644
index 7e3b57393..000000000
--- a/sys-libs/zlib/patches/zlib-1.2.11.patchset
+++ /dev/null
@@ -1,24 +0,0 @@
-From faf76068355cc9169c3b3cc6564a352218ee47d1 Mon Sep 17 00:00:00 2001
-From: Adrien Destugues <pulkomandy@pulkomandy.tk>
-Date: Sun, 28 Aug 2016 18:33:07 +0200
-Subject: zlib: export Haiku shared object symbols
-
-zlib by default hides all symbols starting with _ from its ABI, which
-also hides symbols used for ABI versionning on Haiku. This makes
-runtime_loader complain that it can't identify the version used.
-
-diff --git a/zlib.map b/zlib.map
-index 40fa9db..05fa43a 100644
---- a/zlib.map
-+++ b/zlib.map
-@@ -6,6 +6,7 @@ ZLIB_1.2.0 {
-     inflateBackEnd;
-     inflateBackInit_;
-     inflateCopy;
-+    _gSharedObjectHaiku*;
-   local:
-     deflate_copyright;
-     inflate_copyright;
--- 
-2.7.0
-
diff --git a/sys-libs/zlib/patches/zlib-1.2.12.patchset b/sys-libs/zlib/patches/zlib-1.2.12.patchset
new file mode 100644
index 000000000..d71c9988a
--- /dev/null
+++ b/sys-libs/zlib/patches/zlib-1.2.12.patchset
@@ -0,0 +1,76 @@
+From 537ab038d530752fbdb34302f35ee71be07e701b Mon Sep 17 00:00:00 2001
+From: Adrien Destugues <pulkomandy@pulkomandy.tk>
+Date: Sun, 28 Aug 2016 18:33:07 +0200
+Subject: zlib: export Haiku shared object symbols
+
+zlib by default hides all symbols starting with _ from its ABI, which
+also hides symbols used for ABI versionning on Haiku. This makes
+runtime_loader complain that it can't identify the version used.
+
+diff --git a/zlib.map b/zlib.map
+index b330b60..eb6470f 100644
+--- a/zlib.map
++++ b/zlib.map
+@@ -6,6 +6,7 @@ ZLIB_1.2.0 {
+     inflateBackEnd;
+     inflateBackInit_;
+     inflateCopy;
++    _gSharedObjectHaiku*;
+   local:
+     deflate_copyright;
+     inflate_copyright;
+-- 
+2.30.2
+
+
+From b9e2b0c41fe70dea8b2d5f697bcce21b4391f70f Mon Sep 17 00:00:00 2001
+From: Mark Adler <madler@alumni.caltech.edu>
+Date: Wed, 30 Mar 2022 11:14:53 -0700
+Subject: Correct incorrect inputs provided to the CRC functions.
+
+The previous releases of zlib were not sensitive to incorrect CRC
+inputs with bits set above the low 32. This commit restores that
+behavior, so that applications with such bugs will continue to
+operate as before.
+
+diff --git a/crc32.c b/crc32.c
+index a1bdce5..451887b 100644
+--- a/crc32.c
++++ b/crc32.c
+@@ -630,7 +630,7 @@ unsigned long ZEXPORT crc32_z(crc, buf, len)
+ #endif /* DYNAMIC_CRC_TABLE */
+ 
+     /* Pre-condition the CRC */
+-    crc ^= 0xffffffff;
++    crc = (~crc) & 0xffffffff;
+ 
+     /* Compute the CRC up to a word boundary. */
+     while (len && ((z_size_t)buf & 7) != 0) {
+@@ -749,7 +749,7 @@ unsigned long ZEXPORT crc32_z(crc, buf, len)
+ #endif /* DYNAMIC_CRC_TABLE */
+ 
+     /* Pre-condition the CRC */
+-    crc ^= 0xffffffff;
++    crc = (~crc) & 0xffffffff;
+ 
+ #ifdef W
+ 
+@@ -1077,7 +1077,7 @@ uLong ZEXPORT crc32_combine64(crc1, crc2, len2)
+ #ifdef DYNAMIC_CRC_TABLE
+     once(&made, make_crc_table);
+ #endif /* DYNAMIC_CRC_TABLE */
+-    return multmodp(x2nmodp(len2, 3), crc1) ^ crc2;
++    return multmodp(x2nmodp(len2, 3), crc1) ^ (crc2 & 0xffffffff);
+ }
+ 
+ /* ========================================================================= */
+@@ -1112,5 +1112,5 @@ uLong crc32_combine_op(crc1, crc2, op)
+     uLong crc2;
+     uLong op;
+ {
+-    return multmodp(op, crc1) ^ crc2;
++    return multmodp(op, crc1) ^ (crc2 & 0xffffffff);
+ }
+-- 
+2.30.2
+
diff --git a/sys-libs/zlib/zlib-1.2.11.recipe b/sys-libs/zlib/zlib-1.2.12.recipe
similarity index 85%
rename from sys-libs/zlib/zlib-1.2.11.recipe
rename to sys-libs/zlib/zlib-1.2.12.recipe
index aaccf74e5..c4e105785 100644
--- a/sys-libs/zlib/zlib-1.2.11.recipe
+++ b/sys-libs/zlib/zlib-1.2.12.recipe
@@ -12,13 +12,13 @@ reduced, if necessary, at some cost in compression."
 HOMEPAGE="http://www.zlib.net/"
 COPYRIGHT="1995-2017 Jean-loup Gailly and Mark Adler"
 LICENSE="Zlib"
-REVISION="4"
-SOURCE_URI="http://zlib.net/fossils/zlib-$portVersion.tar.gz"
-CHECKSUM_SHA256="c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1"
+REVISION="1"
+SOURCE_URI="http://zlib.net/zlib-$portVersion.tar.gz"
+CHECKSUM_SHA256="91844808532e5ce316b3c010929493c0244f3d37593afd6de04f71821d5136d9"
 PATCHES="zlib-$portVersion.patchset"
 
 ARCHITECTURES="all ?ppc"
-SECONDARY_ARCHITECTURES="x86_gcc2 x86"
+SECONDARY_ARCHITECTURES="x86"
 
 PROVIDES="
 	zlib$secondaryArchSuffix = $portVersion compat >= 1
@@ -61,20 +61,15 @@ PATCH()
 
 BUILD()
 {
-	rm -rf build
-	mkdir build
-	cd build
-
-	cmake -DCMAKE_INSTALL_PREFIX:PATH=$prefix ..
+	cmake -S. -Bbuild \
+		-DCMAKE_BUILD_TYPE=RelWithDebInfo \
+		-DCMAKE_INSTALL_PREFIX:PATH=$prefix
 	make $jobArgs
 }
 
 INSTALL()
 {
-	cd build
-	make install
-
-	touch $libDir/libz.so.1
+	make -C build install
 
 	prepareInstalledDevelLib libz