diff --git a/monav/contractionhierarchies/contractionhierarchiesclient.pro b/monav/contractionhierarchies/contractionhierarchiesclient.pro
index 52212cc..81b4284 100644
--- a/monav/contractionhierarchies/contractionhierarchiesclient.pro
+++ b/monav/contractionhierarchies/contractionhierarchiesclient.pro
@@ -2,6 +2,12 @@ TEMPLATE = lib
 CONFIG += plugin
 #CONFIG += debug
 DESTDIR = ..
+unix {
+	QMAKE_CXXFLAGS_RELEASE -= -O2
+	QMAKE_CXXFLAGS_RELEASE += -O3 \
+		 -Wno-unused-function
+	QMAKE_CXXFLAGS_DEBUG += -Wno-unused-function
+}
 
 HEADERS += \
     utils/coordinates.h \
diff --git a/monav/gpsgrid/gpsgridclient.pro b/monav/gpsgrid/gpsgridclient.pro
index 291b65c..4d26c13 100644
--- a/monav/gpsgrid/gpsgridclient.pro
+++ b/monav/gpsgrid/gpsgridclient.pro
@@ -20,5 +20,12 @@ HEADERS += \
     utils/bithelpers.h \
     utils/qthelpers.h
 
+unix {
+	QMAKE_CXXFLAGS_RELEASE -= -O2
+	QMAKE_CXXFLAGS_RELEASE += -O3 \
+		 -Wno-unused-function
+	QMAKE_CXXFLAGS_DEBUG += -Wno-unused-function
+}
+
 SOURCES += \
     gpsgridclient.cpp
diff --git a/monav/unicodetournamenttrie/unicodetournamenttrieclient.pro b/monav/unicodetournamenttrie/unicodetournamenttrieclient.pro
index 5b28be5..e60d838 100644
--- a/monav/unicodetournamenttrie/unicodetournamenttrieclient.pro
+++ b/monav/unicodetournamenttrie/unicodetournamenttrieclient.pro
@@ -15,5 +15,11 @@ HEADERS += utils/coordinates.h \
     unicodetournamenttrieclient.h \
     utils/qthelpers.h
 
+unix {
+	QMAKE_CXXFLAGS_RELEASE -= -O2
+	QMAKE_CXXFLAGS_RELEASE += -O3 -Wno-unused-function
+	QMAKE_CXXFLAGS_DEBUG += -Wno-unused-function
+}
+
 SOURCES += \
     unicodetournamenttrieclient.cpp