diff --git a/dependencies/toolchains b/dependencies/toolchains
index f41762b..4f4b077 160000
--- a/dependencies/toolchains
+++ b/dependencies/toolchains
@@ -1 +1 @@
-Subproject commit f41762b8d96f741314e57f55e3782d4534e8c371
+Subproject commit 4f4b0779e3cc38b9ef6f13cedf7bbfd7dddfd190
diff --git a/platforms/m68k-amigaos-gcc10/prep.sh b/platforms/m68k-amigaos-gcc10/prep.sh
index eafd82a..35ee48a 100755
--- a/platforms/m68k-amigaos-gcc10/prep.sh
+++ b/platforms/m68k-amigaos-gcc10/prep.sh
@@ -18,7 +18,7 @@ git clone https://github.com/madler/zlib.git "${SUBMODULES}"/zlib
 rm -rf "${SUBMODULES}"/zlib/build
 mkdir -p "${SUBMODULES}"/zlib/build
 cd "${SUBMODULES}"/zlib/build
-cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${SYSROOT} -DM68K_CPU=68040 -DM68K_FPU=hard -DM68K_COMMON="${M68K_COMMON} -O3 -fno-exceptions -w -DBIG_ENDIAN -DAMIGA -fpermissive -std=c++14"
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${SYSROOT} -DZLIB_BUILD_TESTING=OFF -DZLIB_BUILD_SHARED=OFF -DM68K_CPU=68040 -DM68K_FPU=hard -DM68K_COMMON="${M68K_COMMON} -O3 -fno-exceptions -w -DBIG_ENDIAN -DAMIGA -fpermissive -std=c++14"
 cmake --build . --config Release --target install -- -j$(getconf _NPROCESSORS_ONLN)
 cd "${SUBMODULES}"
 
diff --git a/platforms/m68k-amigaos/prep.sh b/platforms/m68k-amigaos/prep.sh
index eeb411c..22bd2ac 100755
--- a/platforms/m68k-amigaos/prep.sh
+++ b/platforms/m68k-amigaos/prep.sh
@@ -18,7 +18,7 @@ git clone https://github.com/madler/zlib.git "${SUBMODULES}"/zlib
 rm -rf "${SUBMODULES}"/zlib/build
 mkdir -p "${SUBMODULES}"/zlib/build
 cd "${SUBMODULES}"/zlib/build
-cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${SYSROOT} -DM68K_CPU=68040 -DM68K_FPU=hard -DM68K_COMMON="${M68K_COMMON} -O3 -fno-exceptions -w -DBIG_ENDIAN -DAMIGA -fpermissive -std=c++14"
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${SYSROOT} -DZLIB_BUILD_TESTING=OFF -DZLIB_BUILD_SHARED=OFF -DM68K_CPU=68040 -DM68K_FPU=hard -DM68K_COMMON="${M68K_COMMON} -O3 -fno-exceptions -w -DBIG_ENDIAN -DAMIGA -fpermissive -std=c++14"
 cmake --build . --config Release --target install -- -j$(getconf _NPROCESSORS_ONLN)
 cd "${SUBMODULES}"
 
diff --git a/platforms/ppc-amigaos/prep.sh b/platforms/ppc-amigaos/prep.sh
index 8a02a5d..faae769 100755
--- a/platforms/ppc-amigaos/prep.sh
+++ b/platforms/ppc-amigaos/prep.sh
@@ -18,7 +18,7 @@ git clone https://github.com/madler/zlib.git "${SUBMODULES}"/zlib
 rm -rf "${SUBMODULES}"/zlib/build
 mkdir -p "${SUBMODULES}"/zlib/build
 cd "${SUBMODULES}"/zlib/build
-cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${SYSROOT} -DTOOLCHAIN_COMMON="${M68K_COMMON} -O3 -fno-exceptions -w -DBIG_ENDIAN -DAMIGA -fpermissive -std=c++14"
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${SYSROOT} -DZLIB_BUILD_TESTING=OFF -DTOOLCHAIN_COMMON="${M68K_COMMON} -O3 -fno-exceptions -w -DBIG_ENDIAN -DAMIGA -fpermissive -std=c++14"
 cmake --build . --config Release --target install -- -j$(getconf _NPROCESSORS_ONLN)
 cd "${SUBMODULES}"
 
diff --git a/platforms/ppc-morphos/prep.sh b/platforms/ppc-morphos/prep.sh
index dc0e581..4d6348a 100755
--- a/platforms/ppc-morphos/prep.sh
+++ b/platforms/ppc-morphos/prep.sh
@@ -18,7 +18,7 @@ git clone https://github.com/madler/zlib.git "${SUBMODULES}"/zlib
 rm -rf "${SUBMODULES}"/zlib/build
 mkdir -p "${SUBMODULES}"/zlib/build
 cd "${SUBMODULES}"/zlib/build
-cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${SYSROOT} -DPPC_COMMON="${PPC_COMMON} -O3 -fno-exceptions -w -DBIG_ENDIAN -DAMIGA -fpermissive -std=c++14"
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${SYSROOT} -DZLIB_BUILD_TESTING=OFF -DZLIB_BUILD_SHARED=OFF -DPPC_COMMON="${PPC_COMMON} -O3 -fno-exceptions -w -DBIG_ENDIAN -DAMIGA -fpermissive -std=c++14"
 cmake --build . --config Release --target install -- -j$(getconf _NPROCESSORS_ONLN)
 cd "${SUBMODULES}"