diff --git a/extra/qt5-base/PKGBUILD b/extra/qt5-base/PKGBUILD
index 81ee90567..f212802ab 100644
--- a/extra/qt5-base/PKGBUILD
+++ b/extra/qt5-base/PKGBUILD
@@ -10,7 +10,7 @@ pkgbase=qt5-base
 pkgname=(qt5-base qt5-xcb-private-headers)
 _qtver=5.14.1
 pkgver=${_qtver/-/}
-pkgrel=3
+pkgrel=4
 arch=('x86_64')
 url='https://www.qt.io'
 license=('GPL3' 'LGPL3' 'FDL' 'custom')
@@ -36,7 +36,7 @@ _pkgfqn="${pkgbase/5-/}-everywhere-src-${_qtver}"
 source=("https://download.qt.io/official_releases/qt/${pkgver%.*}/${_qtver}/submodules/${_pkgfqn}.tar.xz"
          qt5-base-cflags.patch)
 sha256sums=('d9d423a6e7bcf1055c0372fc029f14a6fe67dd62c67b83095cde68b60b762cf7'
-            'c70640499637314df68cc7a56519f0bf8b65dd808dd982c96c6f045bba993adf')
+            'cf707cd970650f8b60f8897692b36708ded9ba116723ec8fcd885576783fe85c')
 
 prepare() {
   cd ${_pkgfqn}
diff --git a/extra/qt5-base/qt5-base-cflags.patch b/extra/qt5-base/qt5-base-cflags.patch
index 60662887a..c33aa78e7 100644
--- a/extra/qt5-base/qt5-base-cflags.patch
+++ b/extra/qt5-base/qt5-base-cflags.patch
@@ -1,26 +1,46 @@
 diff --git a/mkspecs/common/g++-unix.conf b/mkspecs/common/g++-unix.conf
-index a493cd5984..79f2d2fff9 100644
+index a493cd5984..41342f5020 100644
 --- a/mkspecs/common/g++-unix.conf
 +++ b/mkspecs/common/g++-unix.conf
-@@ -10,5 +10,5 @@
+@@ -10,5 +10,6 @@
  
  include(g++-base.conf)
  
 -QMAKE_LFLAGS_RELEASE   += -Wl,-O1
-+eval(QMAKE_LFLAGS_RELEASE += $$(LDFLAGS))
++SYSTEM_LDFLAGS = $$(LDFLAGS)
++!isEmpty(SYSTEM_LDFLAGS) { eval(QMAKE_LFLAGS_RELEASE += $$(LDFLAGS)) } else { QMAKE_LFLAGS_RELEASE   += -Wl,-O1 }
  QMAKE_LFLAGS_NOUNDEF   += -Wl,--no-undefined
 diff --git a/mkspecs/common/gcc-base.conf b/mkspecs/common/gcc-base.conf
-index 4d82321cba..4a61fc9d25 100644
+index 1f919d270a..7ef6046326 100644
 --- a/mkspecs/common/gcc-base.conf
 +++ b/mkspecs/common/gcc-base.conf
-@@ -40,8 +40,8 @@ QMAKE_CFLAGS_OPTIMIZE_SIZE = -Os
+@@ -40,9 +40,11 @@ QMAKE_CFLAGS_OPTIMIZE_SIZE = -Os
  QMAKE_CFLAGS_DEPS          += -M
  QMAKE_CFLAGS_WARN_ON       += -Wall -Wextra
  QMAKE_CFLAGS_WARN_OFF      += -w
 -QMAKE_CFLAGS_RELEASE       += $$QMAKE_CFLAGS_OPTIMIZE
 -QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO += $$QMAKE_CFLAGS_OPTIMIZE -g
-+eval(QMAKE_CFLAGS_RELEASE += $$(CFLAGS))
-+eval(QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO += -g $$(CFLAGS))
- QMAKE_CFLAGS_DEBUG         += -g
+-QMAKE_CFLAGS_DEBUG         += -g
++SYSTEM_CFLAGS = $$(CFLAGS)
++SYSTEM_DEBUG_CFLAGS = $$(DEBUG_CFLAGS)
++!isEmpty(SYSTEM_CFLAGS) { eval(QMAKE_CFLAGS_RELEASE += $$(CPPFLAGS) $$(CFLAGS)) } else { QMAKE_CFLAGS_RELEASE += $$QMAKE_CFLAGS_OPTIMIZE }
++!isEmpty(SYSTEM_CFLAGS) { eval(QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO += $$(CPPFLAGS) -g $$(CFLAGS)) } else { QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO += $$QMAKE_CFLAGS_OPTIMIZE -g }
++!isEmpty(SYSTEM_DEBUG_CFLAGS) { eval(QMAKE_CFLAGS_DEBUG += $$(DEBUG_CFLAGS)) } else { QMAKE_CFLAGS_DEBUG += -g }
  QMAKE_CFLAGS_SHLIB         += $$QMAKE_CFLAGS_PIC
  QMAKE_CFLAGS_STATIC_LIB    += $$QMAKE_CFLAGS_PIC
+ QMAKE_CFLAGS_APP           += $$QMAKE_CFLAGS_PIC
+@@ -59,9 +61,11 @@ QMAKE_CXXFLAGS            += $$QMAKE_CFLAGS
+ QMAKE_CXXFLAGS_DEPS       += $$QMAKE_CFLAGS_DEPS
+ QMAKE_CXXFLAGS_WARN_ON    += $$QMAKE_CFLAGS_WARN_ON
+ QMAKE_CXXFLAGS_WARN_OFF   += $$QMAKE_CFLAGS_WARN_OFF
+-QMAKE_CXXFLAGS_RELEASE    += $$QMAKE_CFLAGS_RELEASE
+-QMAKE_CXXFLAGS_RELEASE_WITH_DEBUGINFO += $$QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO
+-QMAKE_CXXFLAGS_DEBUG      += $$QMAKE_CFLAGS_DEBUG
++SYSTEM_CXXFLAGS = $$(CXXFLAGS)
++SYSTEM_DEBUG_CXXFLAGS = $$(DEBUG_CXXFLAGS)
++!isEmpty(SYSTEM_CXXFLAGS) { eval(QMAKE_CXXFLAGS_RELEASE += $$(CPPFLAGS) $$(CXXFLAGS)) } else { QMAKE_CXXFLAGS_RELEASE += $$QMAKE_CFLAGS_OPTIMIZE }
++!isEmpty(SYSTEM_CXXFLAGS) { eval(QMAKE_CXXFLAGS_RELEASE_WITH_DEBUGINFO += $$(CPPFLAGS) -g $$(CXXFLAGS)) } else { QMAKE_CXXFLAGS_RELEASE_WITH_DEBUGINFO += $$QMAKE_CFLAGS_OPTIMIZE -g }
++!isEmpty(SYSTEM_DEBUG_CXXFLAGS) { eval(QMAKE_CXXFLAGS_DEBUG += $$(DEBUG_CXXFLAGS)) } else { QMAKE_CXXFLAGS_DEBUG += -g }
+ QMAKE_CXXFLAGS_SHLIB      += $$QMAKE_CFLAGS_SHLIB
+ QMAKE_CXXFLAGS_STATIC_LIB += $$QMAKE_CFLAGS_STATIC_LIB
+ QMAKE_CXXFLAGS_APP        += $$QMAKE_CFLAGS_APP