Upstream added a gtk2 platform theme

.SRCINFO

@@ -3,6 +3,7 @@ pkgbase = qt5-styleplugins
 	pkgver = 5.0.0
 	pkgrel = 2
 	url = https://code.qt.io/cgit/qt/qtstyleplugins
+	install = install.sh
 	arch = i686
 	arch = x86_64
 	license = LGPL

PKGBUILD

@@ -21,6 +21,8 @@ sha512sums=(
     'SKIP'
 )
 
+install='install.sh'
+
 prepare() {
     cd "${srcdir}/${_srcname}"
 

install.sh

@@ -0,0 +1,17 @@
+_5_0_0_2_changes() {
+    echo ':: Upstream added a gtk2 platform theme'
+    echo '   unexport `QT_STYLE_OVERRIDE`'
+    echo '   export `QT_QPA_PLATFORMTHEME=gtk2`'
+}
+
+post_upgrade() {
+    local versions=(
+        '5.0.0-2'
+    )
+    local version
+    for version in "${versions[@]}"; do
+        if [[ "$( vercmp "${version}" "${2}" )" -eq 1 ]]; then
+            "$( printf '_%s_changes' "${version}" | perl -p -e 's/\.|-/_/g' )"
+        fi
+    done
+}