Index: buildsys.mk.in
==================================================================
--- buildsys.mk.in
+++ buildsys.mk.in
@@ -199,11 +199,11 @@
 	${CPP} ${CPPFLAGS} ${OBJCFLAGS} -M $< | \
 	sed 's/^\([^\.]*\)\.o:/\1.o \1.lib.o \1.plugin.o:/' >$@ || \
 	{ rm -f $@; false; }
 
 .mm.mm.dep:
-	${CPP} ${CPPFLAGS} ${OBJCPPFLAGS} -M $< | \
+	${CPP} ${CPPFLAGS} ${OBJCXXFLAGS} -M $< | \
 	sed 's/^\([^\.]*\)\.o:/\1.o \1.lib.o \1.plugin.o:/' >$@ || \
 	{ rm -f $@; false; }
 
 .S.S.dep:
 	${CPP} ${CPPFLAGS} ${ASFLAGS} -M $< | \
@@ -511,29 +511,29 @@
 
 .mm.o:
 	${COMPILE_STATUS}
 	in="$<"; \
 	out="$@"; \
-	if ${OBJCXX} ${OBJCXXFLAGS} ${OBJCFLAGS} ${CXXFLAGS} ${CPPFLAGS} ${OBJCXXFLAGS_$@} -c -o $@ $<; then \
+	if ${OBJCXX} ${OBJCXXFLAGS} ${CPPFLAGS} ${OBJCXXFLAGS_$@} -c -o $@ $<; then \
 		${COMPILE_OK}; \
 	else \
 		${COMPILE_FAILED}; \
 	fi
 .mm.lib.o:
 	${COMPILE_LIB_STATUS}
 	in="$<"; \
 	out="$@"; \
-	if ${OBJCXX} ${LIB_CFLAGS} ${OBJCXXFLAGS} ${OBJCFLAGS} ${CXXFLAGS} ${CPPFLAGS} ${OBJCXXFLAGS_$@} -c -o $@ $<; then \
+	if ${OBJCXX} ${LIB_CFLAGS} ${OBJCXXFLAGS} ${CPPFLAGS} ${OBJCXXFLAGS_$@} -c -o $@ $<; then \
 		${COMPILE_LIB_OK}; \
 	else \
 		${COMPILE_LIB_FAILED}; \
 	fi
 .mm.plugin.o:
 	${COMPILE_PLUGIN_STATUS}
 	in="$<"; \
 	out="$@"; \
-	if ${OBJCXX} ${PLUGIN_CFLAGS} ${OBJCXXFLAGS} ${OBJCFLAGS} ${CXXFLAGS} ${CPPFLAGS} ${OBJCXXFLAGS_$@} -c -o $@ $<; then \
+	if ${OBJCXX} ${PLUGIN_CFLAGS} ${OBJCXXFLAGS} ${CPPFLAGS} ${OBJCXXFLAGS_$@} -c -o $@ $<; then \
 		${COMPILE_PLUGIN_OK}; \
 	else \
 		${COMPILE_PLUGIN_FAILED}; \
 	fi
 

Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -17,18 +17,19 @@
 AC_LANG([Objective C++])
 AC_PROG_OBJCXX(clang++ g++)
 AC_PROG_OBJCXXCPP
 AC_PROG_LN_S
 AC_PROG_INSTALL
+AC_PROG_EGREP
 
 CPP="$OBJCXXCPP"
 CPPFLAGS="$CPPFLAGS $OBJCPPFLAGS $($OBJFW_CONFIG --cppflags)"
 OBJCFLAGS="$OBJCFLAGS -Wall $($OBJFW_CONFIG --objcflags)"
 LDFLAGS="$LDFLAGS $($OBJFW_CONFIG --ldflags --rpath)"
 LIBS="$LIBS $($OBJFW_CONFIG --libs)"
 
-AX_CHECK_COMPILER_FLAGS(-std=c++11, [CXXFLAGS="$CXXFLAGS -std=c++11"], [
+AX_CHECK_COMPILER_FLAGS(-std=c++11, [OBJCXXFLAGS="$OBJCXXFLAGS -std=c++11"], [
 	AC_MSG_ERROR(You need a compiler that supports C++11!)
 ])
 
 AX_CHECK_COMPILER_FLAGS(-pipe, [OBJCFLAGS="$OBJCFLAGS -pipe"])
 AX_CHECK_COMPILER_FLAGS(-fno-common, [OBJCFLAGS="$OBJCFLAGS -fno-common"])
@@ -85,10 +86,24 @@
 	AC_MSG_ERROR(You need Qt5Widgets >= 5.5 installed!)
 ])
 AS_IF([test x"$GOBJC" = x"yes"], [
 	OBJCFLAGS="$OBJCFLAGS -Wwrite-strings -Wpointer-arith -Werror"
 ])
+
+AC_MSG_CHECKING(whether Qt requires PIC)
+AC_EGREP_CPP(yes, [
+	#include <qglobal.h>
+
+	#ifdef QT_REDUCE_RELOCATIONS
+	yes
+	#endif
+], [
+	OBJCXXFLAGS="$LIB_CFLAGS $OBJCXXFLAGS"
+	AC_MSG_RESULT(yes)
+], [
+	AC_MSG_RESULT(no)
+])
 
 BUILDSYS_INIT
 
 dnl We don't call AC_PROG_CPP or AC_PROG_OBJC, but only AC_PROG_OBJCPPCXX and
 dnl set CPP and OBJCC to OBJCPPCXX and add OBJCXXCPPFLAGS to CPPFLAGS, thus we