diff --git a/Compiler/openmpi/build b/Compiler/openmpi/build
index f447061..14a6042 100755
--- a/Compiler/openmpi/build
+++ b/Compiler/openmpi/build
@@ -1,8 +1,8 @@
 #!/usr/bin/env modbuild
 
 pbuild::set_download_url \
-	"http://www.open-mpi.org/software/ompi/v${V_MAJOR}.${V_MINOR}/downloads/openmpi-$V.tar.bz2" \
-	'c654ed847f34a278c52a15c98add40402b4a90f0c540779f1ae6c489af8a76c5'
+	"http://www.open-mpi.org/software/ompi/v${V_MAJOR}.${V_MINOR}/downloads/openmpi-$V.tar.bz2"
+pbuild::set_sha256sum "openmpi-3.1.2.tar.bz2:c654ed847f34a278c52a15c98add40402b4a90f0c540779f1ae6c489af8a76c5"
 
 pbuild::configure() {
 	declare -a config_args=()
diff --git a/HDF5/trilinos/build b/HDF5/trilinos/build
index ca333dd..52c7384 100755
--- a/HDF5/trilinos/build
+++ b/HDF5/trilinos/build
@@ -2,9 +2,11 @@
 
 pbuild::set_download_url \
 	"https://github.com/$P/$P/tarball/$P-release-${V//./-}" \
-	"c8f2029fa36230b9f384c56139aaa33111227bcf653e73f7daf3c9efdecc1d2d" \
 	"$P-$V.tar.gz"
 
+pbuild::set_sha256sum \
+	"trilinos-12.12.1.tar.gz:c8f2029fa36230b9f384c56139aaa33111227bcf653e73f7daf3c9efdecc1d2d"
+
 declare -rx AR=ar
 
 pbuild::configure() {
diff --git a/System/pkg-config/build b/System/pkg-config/build
index d20f6f9..c7789b1 100755
--- a/System/pkg-config/build
+++ b/System/pkg-config/build
@@ -3,8 +3,9 @@
 pbuild::add_to_group 'System'
 
 pbuild::set_download_url \
-	"https://$P.freedesktop.org/releases/$P-$V.tar.gz" \
-	'6fc69c01688c9458a57eb9a1664c9aba372ccda420a02bf4429fe610e7e7d591'
+	"https://$P.freedesktop.org/releases/$P-$V.tar.gz"
+
+pbuild::set_sha256sum 'pkg-config-0.29.2.tar.gz:6fc69c01688c9458a57eb9a1664c9aba372ccda420a02bf4429fe610e7e7d591'
 pbuild::add_configure_args "--with-internal-glib"
 pbuild::install_docfiles 'AUTHORS' 'COPYING' 'NEWS' 'ChangeLog'
 pbuild::install_docfiles 'README' 'INSTALL' 'README.win32'
diff --git a/Tools/gnuplot/build b/Tools/gnuplot/build
index 54aa941..3109f44 100755
--- a/Tools/gnuplot/build
+++ b/Tools/gnuplot/build
@@ -3,8 +3,8 @@
 pbuild::add_to_group 'Tools'
 
 pbuild::set_download_url \
-	"https://sourceforge.net/projects/gnuplot/files/$P/$V/$P-$V.tar.gz" \
-	'1515f000bd373aaa53b16183f274189d4f5e0ae47d22f434857933d16a4770cb'
+	"https://sourceforge.net/projects/gnuplot/files/$P/$V/$P-$V.tar.gz"
+pbuild::set_sha256sum 'gnuplot-5.2.4.tar.gz:1515f000bd373aaa53b16183f274189d4f5e0ae47d22f434857933d16a4770cb'
 pbuild::install_docfiles 'Copyright' 'ChangeLog' 'NEWS' 'README'
 
 pbuild::make_all