diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
index bbe74eb2b8..addc61f186 100755
--- a/util/crossgcc/buildgcc
+++ b/util/crossgcc/buildgcc
@@ -46,9 +46,9 @@ IASL_VERSION=20180531
 PYTHON_VERSION=3.5.1
 EXPAT_VERSION=2.2.1
 # CLANG version number
-CLANG_VERSION=4.0.0
+CLANG_VERSION=6.0.0
 MAKE_VERSION=4.2.1
-CMAKE_VERSION=3.9.0-rc3
+CMAKE_VERSION=3.11.3
 
 # GCC toolchain archive locations
 # These are sanitized by the jenkins toolchain test builder, so if
@@ -69,7 +69,7 @@ CFE_ARCHIVE="https://releases.llvm.org/${CLANG_VERSION}/cfe-${CLANG_VERSION}.src
 CRT_ARCHIVE="https://releases.llvm.org/${CLANG_VERSION}/compiler-rt-${CLANG_VERSION}.src.tar.xz"
 CTE_ARCHIVE="https://releases.llvm.org/${CLANG_VERSION}/clang-tools-extra-${CLANG_VERSION}.src.tar.xz"
 MAKE_ARCHIVE="https://ftpmirror.gnu.org/make/make-${MAKE_VERSION}.tar.bz2"
-CMAKE_ARCHIVE="https://cmake.org/files/v3.9/cmake-${CMAKE_VERSION}.tar.gz"
+CMAKE_ARCHIVE="https://cmake.org/files/v3.11/cmake-${CMAKE_VERSION}.tar.gz"
 
 ALL_ARCHIVES="$GMP_ARCHIVE $MPFR_ARCHIVE $MPC_ARCHIVE \
 	$GCC_ARCHIVE $BINUTILS_ARCHIVE $GDB_ARCHIVE $IASL_ARCHIVE \
diff --git a/util/crossgcc/sum/cfe-4.0.0.src.tar.xz.cksum b/util/crossgcc/sum/cfe-4.0.0.src.tar.xz.cksum
deleted file mode 100644
index 00a5596878..0000000000
--- a/util/crossgcc/sum/cfe-4.0.0.src.tar.xz.cksum
+++ /dev/null
@@ -1 +0,0 @@
-e2762800c93d9335781ea6a45af3f80845542ef5  tarballs/cfe-4.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/cfe-6.0.0.src.tar.xz.cksum b/util/crossgcc/sum/cfe-6.0.0.src.tar.xz.cksum
new file mode 100644
index 0000000000..523445035f
--- /dev/null
+++ b/util/crossgcc/sum/cfe-6.0.0.src.tar.xz.cksum
@@ -0,0 +1 @@
+4cc7bef72fda70ac5e065ca0ae2d66957abe6f2a  tarballs/cfe-6.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/clang-tools-extra-4.0.0.src.tar.xz.cksum b/util/crossgcc/sum/clang-tools-extra-4.0.0.src.tar.xz.cksum
deleted file mode 100644
index dbf642c461..0000000000
--- a/util/crossgcc/sum/clang-tools-extra-4.0.0.src.tar.xz.cksum
+++ /dev/null
@@ -1 +0,0 @@
-bdb543c4bb87bd80fe65711114ca0a5c25329ae3  tarballs/clang-tools-extra-4.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/clang-tools-extra-6.0.0.src.tar.xz.cksum b/util/crossgcc/sum/clang-tools-extra-6.0.0.src.tar.xz.cksum
new file mode 100644
index 0000000000..9fcb8280d1
--- /dev/null
+++ b/util/crossgcc/sum/clang-tools-extra-6.0.0.src.tar.xz.cksum
@@ -0,0 +1 @@
+c960a0d565e46e4c4f6976fac389f753076ca72e  tarballs/clang-tools-extra-6.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/cmake-3.11.3.tar.gz.cksum b/util/crossgcc/sum/cmake-3.11.3.tar.gz.cksum
new file mode 100644
index 0000000000..14a4b22c8d
--- /dev/null
+++ b/util/crossgcc/sum/cmake-3.11.3.tar.gz.cksum
@@ -0,0 +1 @@
+73261a5b7f71abf7277c1d2a418ca3c4cf170c89  tarballs/cmake-3.11.3.tar.gz
diff --git a/util/crossgcc/sum/cmake-3.9.0-rc3.tar.gz.cksum b/util/crossgcc/sum/cmake-3.9.0-rc3.tar.gz.cksum
deleted file mode 100644
index 809ce3c7ca..0000000000
--- a/util/crossgcc/sum/cmake-3.9.0-rc3.tar.gz.cksum
+++ /dev/null
@@ -1 +0,0 @@
-d568e74e2e4a1cdeae1820cc2cb36fd2d6afc8fe  tarballs/cmake-3.9.0-rc3.tar.gz
diff --git a/util/crossgcc/sum/compiler-rt-4.0.0.src.tar.xz.cksum b/util/crossgcc/sum/compiler-rt-4.0.0.src.tar.xz.cksum
deleted file mode 100644
index 95da5148ed..0000000000
--- a/util/crossgcc/sum/compiler-rt-4.0.0.src.tar.xz.cksum
+++ /dev/null
@@ -1 +0,0 @@
-a879b610e427ef3bba482bdc031ae371cabab81e  tarballs/compiler-rt-4.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/compiler-rt-6.0.0.src.tar.xz.cksum b/util/crossgcc/sum/compiler-rt-6.0.0.src.tar.xz.cksum
new file mode 100644
index 0000000000..88186dbf38
--- /dev/null
+++ b/util/crossgcc/sum/compiler-rt-6.0.0.src.tar.xz.cksum
@@ -0,0 +1 @@
+5725f19be611034e77196461cdb4989f4258cfa4  tarballs/compiler-rt-6.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/llvm-4.0.0.src.tar.xz.cksum b/util/crossgcc/sum/llvm-4.0.0.src.tar.xz.cksum
deleted file mode 100644
index 410f95fb1a..0000000000
--- a/util/crossgcc/sum/llvm-4.0.0.src.tar.xz.cksum
+++ /dev/null
@@ -1 +0,0 @@
-aee4524e2407f9fe5afc6f70c753180b907011d0  tarballs/llvm-4.0.0.src.tar.xz
diff --git a/util/crossgcc/sum/llvm-6.0.0.src.tar.xz.cksum b/util/crossgcc/sum/llvm-6.0.0.src.tar.xz.cksum
new file mode 100644
index 0000000000..ac079eccf5
--- /dev/null
+++ b/util/crossgcc/sum/llvm-6.0.0.src.tar.xz.cksum
@@ -0,0 +1 @@
+f61e0a35feb76644ba160a413ee209dd24c88f47  tarballs/llvm-6.0.0.src.tar.xz