diff --git a/graphics/glslang/README b/graphics/glslang/README
index e93d06b191..d61381b370 100644
--- a/graphics/glslang/README
+++ b/graphics/glslang/README
@@ -1,2 +1,5 @@
 Khronos-reference front end for GLSL/ESSL, partial front end for HLSL,
 and a SPIR-V generator.
+
+If SPIRV-Tools is not installed a package will be created where illegal
+SPIRV may be generated for HLSL.
diff --git a/graphics/glslang/SPIRV-Tools-shared.patch b/graphics/glslang/SPIRV-Tools-shared.patch
new file mode 100644
index 0000000000..34cb8ad9bc
--- /dev/null
+++ b/graphics/glslang/SPIRV-Tools-shared.patch
@@ -0,0 +1,61 @@
+From 1504af077935a0bfd1b1b59f77d8b1cd89f913b5 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?R=C3=A9mi=20Verschelde?= <rverschelde@gmail.com>
+Date: Mon, 10 Dec 2018 13:05:15 +0100
+Subject: [PATCH] CMake: Allow linking against system-installed SPIRV-Tools
+
+Fixes #1585.
+---
+ CMakeLists.txt       |  7 ++++++-
+ SPIRV/CMakeLists.txt | 21 +++++++++++++--------
+ 2 files changed, 19 insertions(+), 9 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index ada2b8fb9..22243f491 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -320,7 +320,12 @@ if(BUILD_EXTERNAL AND IS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/External)
+     add_subdirectory(External)
+ endif()
+ 
+-if(NOT TARGET SPIRV-Tools-opt)
++find_package(PkgConfig)
++if(PkgConfig_FOUND)
++    pkg_check_modules(SPIRV-Tools SPIRV-Tools)
++endif()
++# Former would be system-installed, later is from External
++if(NOT SPIRV-Tools_FOUND AND NOT TARGET SPIRV-Tools-opt)
+     set(ENABLE_OPT OFF)
+ endif()
+ 
+diff --git a/SPIRV/CMakeLists.txt b/SPIRV/CMakeLists.txt
+index d699daddb..28beb47bb 100644
+--- a/SPIRV/CMakeLists.txt
++++ b/SPIRV/CMakeLists.txt
+@@ -91,14 +91,19 @@ if(WIN32 AND BUILD_SHARED_LIBS)
+ endif()
+ 
+ if(ENABLE_OPT)
+-    target_include_directories(SPIRV
+-        PRIVATE ${spirv-tools_SOURCE_DIR}/include
+-        PRIVATE ${spirv-tools_SOURCE_DIR}/source
+-    )
+-    target_link_libraries(SPIRV PRIVATE MachineIndependent SPIRV-Tools-opt)
+-    target_include_directories(SPIRV PUBLIC
+-        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../External>
+-        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/External>)
++    if(SPIRV-Tools_FOUND)
++        target_include_directories(SPIRV PUBLIC ${SPIRV-Tools_INCLUDEDIR})
++        target_link_libraries(SPIRV glslang ${SPIRV-Tools_LIBRARIES})
++    else()
++        target_include_directories(SPIRV
++            PRIVATE ${spirv-tools_SOURCE_DIR}/include
++            PRIVATE ${spirv-tools_SOURCE_DIR}/source
++        )
++        target_link_libraries(SPIRV PRIVATE MachineIndependent SPIRV-Tools-opt)
++        target_include_directories(SPIRV PUBLIC
++            $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../External>
++            $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/External>)
++    endif()
+ else()
+     target_link_libraries(SPIRV PRIVATE MachineIndependent)
+ endif(ENABLE_OPT)
diff --git a/graphics/glslang/glslang.SlackBuild b/graphics/glslang/glslang.SlackBuild
index d51ff730b5..7aa9999698 100644
--- a/graphics/glslang/glslang.SlackBuild
+++ b/graphics/glslang/glslang.SlackBuild
@@ -22,12 +22,9 @@
 #  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-# For best compatibility use git versions which vulkan-sdk upstream also uses.
-# Vulkan-ValidationLayers/scripts/known_good.json
-# https://github.com/KhronosGroup/Vulkan-ValidationLayers/issues/1082
-
 PRGNAM=glslang
-VERSION=${VERSION:-bacaef3237c515e40d1a24722be48c0a0b30f75f}
+VERSION=${VERSION:-11.0.0}
+SRCVERS="10-$VERSION"
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
 
@@ -60,27 +57,12 @@ fi
 
 set -eu
 
-# For best compatibility use git versions which glslang upstream also uses.
-# glslang/known_good.json
-SPIRV_HEADERS_VERSION=${SPIRV_HEADERS_VERSION:-060627f0b0d2fa8581b5acb939f46e3b9e500593}
-SPIRV_TOOLS_VERSION=${SPIRV_TOOLS_VERSION:-0a1fb588cd365f7737cb121fdd64553923e0cef6}
-
 rm -rf $PKG
 mkdir -p $TMP $PKG $OUTPUT
 cd $TMP
-rm -rf $PRGNAM-$VERSION
-tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
-cd $PRGNAM-$VERSION
-
-(
-  cd External
-  tar xvf $CWD/SPIRV-Tools-$SPIRV_TOOLS_VERSION.tar.gz
-  mv SPIRV-Tools-$SPIRV_TOOLS_VERSION spirv-tools
-  cd spirv-tools/external
-  tar xvf $CWD/SPIRV-Headers-$SPIRV_HEADERS_VERSION.tar.gz
-  mv SPIRV-Headers-$SPIRV_HEADERS_VERSION spirv-headers
-)
-
+rm -rf $PRGNAM-$SRCVERS
+tar xvf $CWD/$PRGNAM-$SRCVERS.tar.gz
+cd $PRGNAM-$SRCVERS
 chown -R root:root .
 find -L . \
  \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
@@ -88,13 +70,18 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
+# CMake: Allow linking against system-installed SPIRV-Tools
+# https://github.com/KhronosGroup/glslang/issues/1585
+# https://github.com/KhronosGroup/glslang/pull/1621
+patch -p1 < $CWD/SPIRV-Tools-shared.patch
+
 mkdir -p build
 cd build
   cmake \
-    -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
     -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
     -DCMAKE_INSTALL_PREFIX=/usr \
     -DCMAKE_INSTALL_LIBDIR=lib$LIBDIRSUFFIX \
+    -DBUILD_EXTERNAL=OFF \
     -DBUILD_SHARED_LIBS=ON \
     -DCMAKE_SKIP_RPATH=TRUE \
     -DCMAKE_BUILD_TYPE=Release ..
@@ -112,7 +99,6 @@ cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
 
 mkdir -p $PKG/install
 cat $CWD/slack-desc > $PKG/install/slack-desc
-#cat $CWD/doinst.sh > $PKG/install/doinst.sh
 
 cd $PKG
 /sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}
diff --git a/graphics/glslang/glslang.info b/graphics/glslang/glslang.info
index 4ef3491d89..c03f4f5e84 100644
--- a/graphics/glslang/glslang.info
+++ b/graphics/glslang/glslang.info
@@ -1,14 +1,10 @@
 PRGNAM="glslang"
-VERSION="bacaef3237c515e40d1a24722be48c0a0b30f75f"
+VERSION="11.0.0"
 HOMEPAGE="https://github.com/KhronosGroup/glslang"
-DOWNLOAD="https://github.com/KhronosGroup/glslang/archive/bacaef3237c515e40d1a24722be48c0a0b30f75f/glslang-bacaef3237c515e40d1a24722be48c0a0b30f75f.tar.gz \
-          https://github.com/KhronosGroup/SPIRV-Headers/archive/060627f0b0d2fa8581b5acb939f46e3b9e500593/SPIRV-Headers-060627f0b0d2fa8581b5acb939f46e3b9e500593.tar.gz \
-          https://github.com/KhronosGroup/SPIRV-Tools/archive/0a1fb588cd365f7737cb121fdd64553923e0cef6/SPIRV-Tools-0a1fb588cd365f7737cb121fdd64553923e0cef6.tar.gz"
-MD5SUM="3e631acd4c41c0d5a0b8dd42d32d32c6 \
-        459fc2b250130c38c31e2d9690d32e69 \
-        9ebcd80ceda36ee2df65daf33bb332b2"
+DOWNLOAD="https://github.com/KhronosGroup/glslang/archive/10-11.0.0/glslang-10-11.0.0.tar.gz"
+MD5SUM="c54870922c39b8c307678fdf4ae2e85e"
 DOWNLOAD_x86_64=""
 MD5SUM_x86_64=""
-REQUIRES="python3"
+REQUIRES="SPIRV-Tools"
 MAINTAINER="Hunter Sezen"
 EMAIL="orbea@riseup.net"