diff -upr a/Software/grab/grab.pro b/Software/grab/grab.pro
--- a/Software/grab/grab.pro	2014-09-30 11:18:06.000000000 +0200
+++ b/Software/grab/grab.pro	2020-06-18 19:24:09.817857700 +0200
@@ -22,6 +22,9 @@ INCLUDEPATH += ./include \
                ../src \
                ../math/include \
                ..
+QMAKE_CFLAGS = $$(CFLAGS)
+QMAKE_CXXFLAGS = $$(CXXFLAGS)
+QMAKE_LFLAGS = $$(LDFLAGS)
 
 DEFINES += $${SUPPORTED_GRABBERS}
 # Linux/UNIX platform
Only in b/Software/grab: Makefile
diff -upr a/Software/hooks/hooks.pro b/Software/hooks/hooks.pro
--- a/Software/hooks/hooks.pro	2014-09-30 11:18:06.000000000 +0200
+++ b/Software/hooks/hooks.pro	2020-06-18 19:24:39.595207492 +0200
@@ -31,6 +31,10 @@ QMAKE_CXXFLAGS_EXCEPTIONS_ON -= -mthread
 
 CONFIG -= rtti
 
+QMAKE_CFLAGS = $$(CFLAGS)
+QMAKE_CXXFLAGS = $$(CXXFLAGS)
+QMAKE_LFLAGS = $$(LDFLAGS)
+
 DEFINES += HOOKSDLL_EXPORTS UNICODE
 
 CONFIG(msvc) {
Only in b/Software: lib
diff -upr a/Software/libraryinjector/libraryinjector.pro b/Software/libraryinjector/libraryinjector.pro
--- a/Software/libraryinjector/libraryinjector.pro	2014-09-30 11:18:06.000000000 +0200
+++ b/Software/libraryinjector/libraryinjector.pro	2020-06-18 19:24:29.168301676 +0200
@@ -10,6 +10,9 @@ DESTDIR  = ../lib
 TARGET   = libraryinjector
 TEMPLATE = lib
 LIBS += -luuid -lole32 -ladvapi32 -luser32
+QMAKE_CFLAGS = $$(CFLAGS)
+QMAKE_CXXFLAGS = $$(CXXFLAGS)
+QMAKE_LFLAGS = $$(LDFLAGS)
 
 DEFINES += LIBRARYINJECTOR_LIBRARY
 CONFIG(msvc) {
Only in b/Software: Makefile
Only in b/Software/math: Makefile
Only in b/Software: .qmake.stash
Only in b/Software/src: bin
Only in b/Software/src: Makefile
diff -upr a/Software/src/src.pro b/Software/src/src.pro
--- a/Software/src/src.pro	2014-09-30 11:18:06.000000000 +0200
+++ b/Software/src/src.pro	2020-06-18 19:24:54.378879801 +0200
@@ -58,6 +58,10 @@ DEFINES += $${SUPPORTED_GRABBERS}
 
 LIBS    += -L../lib -lgrab -lprismatik-math
 
+QMAKE_CFLAGS = $$(CFLAGS)
+QMAKE_CXXFLAGS = $$(CXXFLAGS)
+QMAKE_LFLAGS = $$(LDFLAGS)
+
 unix:!macx{
     CONFIG    += link_pkgconfig debug
     PKGCONFIG += libusb-1.0
Only in b/Software/src: stuff
diff -upr a/Software/tests/tests.pro b/Software/tests/tests.pro
--- a/Software/tests/tests.pro	2014-09-30 11:18:06.000000000 +0200
+++ b/Software/tests/tests.pro	2020-06-18 19:24:59.275658721 +0200
@@ -12,6 +12,10 @@ DESTDIR     = bin
 CONFIG     += console
 CONFIG     -= app_bundle

+QMAKE_CFLAGS = $$(CFLAGS)
+QMAKE_CXXFLAGS = $$(CXXFLAGS)
+QMAKE_LFLAGS = $$(LDFLAGS)
+
 CONFIG(gcc):QMAKE_CXXFLAGS += -std=c++11

 # QMake and GCC produce a lot of stuff