diff --git a/daemon/Makefile b/daemon/Makefile
index 46c9f5f2e..3b7b34a02 100644
--- a/daemon/Makefile
+++ b/daemon/Makefile
@@ -6,17 +6,10 @@ include ../lib/deps.Makefile
 
 with_transcoding ?= yes
 
-ifeq ($(origin CFLAGS),undefined)
-CFLAGS:=	-g -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wstrict-prototypes -Werror=return-type \
-		-Wshadow
-else
-CFLAGS:=	$(CFLAGS)
-endif
-CFLAGS+=	-pthread
-CFLAGS+=	-std=c11
+include ../lib/flags.Makefile
+
 CFLAGS+=	-I. -I../kernel-module/ -I../lib/ -I../include/
 CFLAGS+=	-Iprivate
-CFLAGS+=	-D_GNU_SOURCE
 CFLAGS+=	$(CFLAGS_GLIB)
 CFLAGS+=	$(CFLAGS_GTHREAD)
 CFLAGS+=	$(CFLAGS_LIBZ)
@@ -35,7 +28,6 @@ CFLAGS+=	$(CFLAGS_LIBSWRESAMPLE)
 CFLAGS+=	$(CFLAGS_LIBAVFILTER)
 CFLAGS+=	$(CFLAGS_SPANDSP)
 CFLAGS+=	$(CFLAGS_OPUS)
-CFLAGS+=	-DWITH_TRANSCODING
 CFLAGS+=	$(CFLAGS_MYSQL)
 else
 CFLAGS+=	-DWITHOUT_CODECLIB
@@ -48,7 +40,6 @@ endif
 #CFLAGS+=	-DSRTCP_KEY_DERIVATION_RFC_COMPLIANCE
 #CFLAGS+=	-DSTRICT_SDES_KEY_LIFETIME
 
-LDLIBS:=	-lm -ldl
 LDLIBS+=	$(LDLIBS_GLIB)
 LDLIBS+=	$(LDLIBS_GTHREAD)
 LDLIBS+=	$(LDLIBS_LIBZ)
diff --git a/lib/common.Makefile b/lib/common.Makefile
index 06078bccb..791ebb019 100644
--- a/lib/common.Makefile
+++ b/lib/common.Makefile
@@ -2,10 +2,6 @@
 
 include ../lib/lib.Makefile
 
-CFLAGS += -fPIE
-LDFLAGS += -pie
-LDLIBS += -latomic
-
 all:	$(TARGET) $(MANS)
 
 
diff --git a/lib/flags.Makefile b/lib/flags.Makefile
new file mode 100644
index 000000000..52fdd154b
--- /dev/null
+++ b/lib/flags.Makefile
@@ -0,0 +1,22 @@
+with_transcoding ?= yes
+
+ifeq ($(origin CFLAGS),undefined)
+CFLAGS := -g -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wstrict-prototypes -Werror=return-type \
+		-Wshadow
+else
+CFLAGS := $(CFLAGS)
+endif
+
+CFLAGS += -I. -I$(top_srcdir)/kernel-module/ -I$(top_srcdir)/lib/
+CFLAGS += -pthread
+CFLAGS += -std=c11
+CFLAGS += -D_GNU_SOURCE -D_POSIX_SOURCE -D_POSIX_C_SOURCE
+CFLAGS += -fPIE
+
+ifeq ($(with_transcoding),yes)
+CFLAGS += -DWITH_TRANSCODING
+endif
+
+LDFLAGS += -pie
+
+LDLIBS := -lm -ldl -latomic
diff --git a/perf-tester/Makefile b/perf-tester/Makefile
index a84dc4c67..3af982e2e 100644
--- a/perf-tester/Makefile
+++ b/perf-tester/Makefile
@@ -6,17 +6,9 @@ include ../lib/deps.Makefile
 
 FIXTURES_PATH ?= ../fixtures
 
-ifeq ($(origin CFLAGS),undefined)
-CFLAGS ?= -g -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wstrict-prototypes -Werror=return-type \
-		-Wshadow
-else
-CFLAGS := $(CFLAGS)
-endif
+include ../lib/flags.Makefile
 
-CFLAGS += -pthread
-CFLAGS += -std=c11
 CFLAGS += -I. -I../kernel-module/ -I../lib/
-CFLAGS += -D_GNU_SOURCE
 CFLAGS += -DFIXTURES_PATH="\"$(FIXTURES_PATH)\""
 CFLAGS += -DWITH_TRANSCODING
 CFLAGS += $(CFLAGS_LIBPCRE)
@@ -33,7 +25,6 @@ CFLAGS += $(CFLAGS_OPUS)
 CFLAGS += $(CFLAGS_NCURSESW)
 CFLAGS += $(CFLAGS_OPENSSL)
 
-LDLIBS := -lm -ldl
 LDLIBS += $(LDLIBS_GLIB)
 LDLIBS += $(LDLIBS_JSON_GLIB)
 LDLIBS += $(LDLIBS_GTHREAD)
diff --git a/recording-daemon/Makefile b/recording-daemon/Makefile
index 6d121fb27..da08aa4e3 100644
--- a/recording-daemon/Makefile
+++ b/recording-daemon/Makefile
@@ -4,16 +4,9 @@ export top_srcdir = ..
 
 include ../lib/deps.Makefile
 
-ifeq ($(origin CFLAGS),undefined)
-CFLAGS?=	-g -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wstrict-prototypes -Werror=return-type \
-		-Wshadow
-else
-CFLAGS:=	$(CFLAGS)
-endif
-CFLAGS+=	-pthread
-CFLAGS+=	-std=c11
+include ../lib/flags.Makefile
+
 CFLAGS+=	-I. -I../lib/ -I../kernel-module/
-CFLAGS+=	-D_GNU_SOURCE -D_POSIX_SOURCE -D_POSIX_C_SOURCE
 CFLAGS+=	$(CFLAGS_LIBPCRE)
 CFLAGS+=	$(CFLAGS_GLIB)
 CFLAGS+=	$(CFLAGS_JSON_GLIB)
@@ -29,7 +22,6 @@ CFLAGS+=	$(CFLAGS_OPENSSL)
 CFLAGS+=	$(CFLAGS_LIBCURL)
 CFLAGS+=	$(CFLAGS_LIBJWT)
 
-LDLIBS:=	-lm -ldl
 LDLIBS+=	$(LDLIBS_GLIB)
 LDLIBS+=	$(LDLIBS_JSON_GLIB)
 LDLIBS+=	$(LDLIBS_GTHREAD)
diff --git a/t/Makefile b/t/Makefile
index 7ba2776d6..dfe1fe11d 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -6,17 +6,11 @@ include ../lib/deps.Makefile
 
 with_transcoding ?= yes
 
-ifeq ($(origin CFLAGS),undefined)
-CFLAGS?=	-g -Wall -Wextra -Wno-sign-compare -Wno-unused-parameter -Wstrict-prototypes -Werror=return-type \
-		-Wshadow
-else
-CFLAGS:=	$(CFLAGS)
-endif
+include ../lib/flags.Makefile
+
 PRELOAD_CFLAGS := $(CFLAGS)
-CFLAGS+=	-pthread
-CFLAGS+=	-std=c11
+
 CFLAGS+=	-I. -I../lib/ -I../kernel-module/ -I../include/
-CFLAGS+=	-D_GNU_SOURCE
 CFLAGS+=	$(CFLAGS_GLIB)
 CFLAGS+=	$(CFLAGS_GTHREAD)
 CFLAGS+=	$(CFLAGS_OPENSSL)
@@ -43,7 +37,6 @@ else
 CFLAGS+=	-DWITHOUT_CODECLIB
 endif
 
-LDLIBS:=	-lm -ldl
 LDLIBS+=	$(LDLIBS_GLIB)
 LDLIBS+=	$(LDLIBS_GTHREAD)
 LDLIBS+=	$(LDLIBS_LIBCRYPTO)