diff --git a/tests/libtest/Makefile.inc b/tests/libtest/Makefile.inc
index 3e6e5f79f..8e5248d25 100644
--- a/tests/libtest/Makefile.inc
+++ b/tests/libtest/Makefile.inc
@@ -28,66 +28,92 @@ noinst_PROGRAMS = chkhostname libauthretry libntlmconnect \
 chkhostname_SOURCES = chkhostname.c $(top_srcdir)/lib/curl_gethostname.c
 chkhostname_LDADD = @CURL_NETWORK_LIBS@
 chkhostname_DEPENDENCIES =
-chkhostname_CFLAGS = $(AM_CFLAGS)
+chkhostname_CPPFLAGS = $(AM_CPPFLAGS)
 
 libntlmconnect_SOURCES = libntlmconnect.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 libntlmconnect_LDADD = $(TESTUTIL_LIBS)
+libntlmconnect_CPPFLAGS = $(AM_CPPFLAGS)
 
 libauthretry_SOURCES = libauthretry.c $(SUPPORTFILES)
+libauthretry_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib500_SOURCES = lib500.c $(SUPPORTFILES) $(TESTUTIL) $(TSTTRACE)
 lib500_LDADD = $(TESTUTIL_LIBS)
+lib500_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib501_SOURCES = lib501.c $(SUPPORTFILES)
+lib501_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib502_SOURCES = lib502.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib502_LDADD = $(TESTUTIL_LIBS)
+lib502_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib503_SOURCES = lib503.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib503_LDADD = $(TESTUTIL_LIBS)
+lib503_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib504_SOURCES = lib504.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib504_LDADD = $(TESTUTIL_LIBS)
+lib504_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib505_SOURCES = lib505.c $(SUPPORTFILES)
+lib505_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib506_SOURCES = lib506.c $(SUPPORTFILES)
+lib506_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib507_SOURCES = lib507.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib507_LDADD = $(TESTUTIL_LIBS)
+lib507_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib508_SOURCES = lib508.c $(SUPPORTFILES)
+lib508_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib510_SOURCES = lib510.c $(SUPPORTFILES)
+lib510_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib511_SOURCES = lib511.c $(SUPPORTFILES)
+lib511_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib512_SOURCES = lib512.c $(SUPPORTFILES)
+lib512_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib513_SOURCES = lib513.c $(SUPPORTFILES)
+lib513_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib514_SOURCES = lib514.c $(SUPPORTFILES)
+lib514_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib515_SOURCES = lib515.c $(SUPPORTFILES)
+lib515_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib516_SOURCES = lib516.c $(SUPPORTFILES)
+lib516_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib517_SOURCES = lib517.c $(SUPPORTFILES)
+lib517_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib518_SOURCES = lib518.c $(SUPPORTFILES) $(WARNLESS)
+lib518_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib519_SOURCES = lib519.c $(SUPPORTFILES)
+lib519_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib520_SOURCES = lib520.c $(SUPPORTFILES)
+lib520_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib521_SOURCES = lib521.c $(SUPPORTFILES)
+lib521_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib523_SOURCES = lib523.c $(SUPPORTFILES)
+lib523_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib524_SOURCES = lib524.c $(SUPPORTFILES)
+lib524_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib525_SOURCES = lib525.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib525_LDADD = $(TESTUTIL_LIBS)
+lib525_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib526_SOURCES = lib526.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib526_LDADD = $(TESTUTIL_LIBS)
@@ -111,118 +137,161 @@ lib532_CPPFLAGS = $(AM_CPPFLAGS) -DLIB532
 
 lib533_SOURCES = lib533.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib533_LDADD = $(TESTUTIL_LIBS)
+lib533_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib536_SOURCES = lib536.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib536_LDADD = $(TESTUTIL_LIBS)
+lib536_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib537_SOURCES = lib537.c $(SUPPORTFILES) $(WARNLESS)
+lib537_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib539_SOURCES = lib539.c $(SUPPORTFILES)
+lib539_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib540_SOURCES = lib540.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib540_LDADD = $(TESTUTIL_LIBS)
+lib540_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib541_SOURCES = lib541.c $(SUPPORTFILES)
+lib541_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib542_SOURCES = lib542.c $(SUPPORTFILES)
+lib542_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib543_SOURCES = lib543.c $(SUPPORTFILES)
+lib543_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib544_SOURCES = lib544.c $(SUPPORTFILES)
+lib544_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib545_SOURCES = lib544.c $(SUPPORTFILES)
 lib545_CPPFLAGS = $(AM_CPPFLAGS) -DLIB545
 
 lib547_SOURCES = lib547.c $(SUPPORTFILES)
+lib547_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib548_SOURCES = lib547.c $(SUPPORTFILES)
 lib548_CPPFLAGS = $(AM_CPPFLAGS) -DLIB548
 
 lib549_SOURCES = lib549.c $(SUPPORTFILES)
+lib549_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib552_SOURCES = lib552.c $(SUPPORTFILES) $(WARNLESS)
+lib552_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib553_SOURCES = lib553.c $(SUPPORTFILES)
+lib553_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib554_SOURCES = lib554.c $(SUPPORTFILES)
+lib554_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib555_SOURCES = lib555.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib555_LDADD = $(TESTUTIL_LIBS)
+lib555_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib556_SOURCES = lib556.c $(SUPPORTFILES)
+lib556_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib557_SOURCES = lib557.c $(SUPPORTFILES)
+lib557_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib560_SOURCES = lib560.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib560_LDADD = $(TESTUTIL_LIBS)
+lib560_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib562_SOURCES = lib562.c $(SUPPORTFILES)
+lib562_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib564_SOURCES = lib564.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib564_LDADD = $(TESTUTIL_LIBS)
+lib564_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib565_SOURCES = lib510.c $(SUPPORTFILES)
 lib565_CPPFLAGS = $(AM_CPPFLAGS) -DLIB565
 
 lib566_SOURCES = lib566.c $(SUPPORTFILES)
+lib566_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib567_SOURCES = lib567.c $(SUPPORTFILES)
+lib567_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib568_SOURCES = lib568.c $(SUPPORTFILES)
+lib568_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib569_SOURCES = lib569.c $(SUPPORTFILES)
+lib569_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib570_SOURCES = lib570.c $(SUPPORTFILES)
+lib570_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib571_SOURCES = lib571.c $(SUPPORTFILES) $(WARNLESS)
+lib571_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib572_SOURCES = lib572.c $(SUPPORTFILES)
+lib572_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib573_SOURCES = lib573.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS) $(TSTTRACE)
 lib573_LDADD = $(TESTUTIL_LIBS)
+lib573_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib574_SOURCES = lib574.c $(SUPPORTFILES)
+lib574_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib575_SOURCES = lib575.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib575_LDADD = $(TESTUTIL_LIBS)
+lib575_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib576_SOURCES = lib576.c $(SUPPORTFILES)
+lib576_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib578_SOURCES = lib578.c $(SUPPORTFILES)
+lib578_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib579_SOURCES = lib579.c $(SUPPORTFILES)
+lib579_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib582_SOURCES = lib582.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib582_LDADD = $(TESTUTIL_LIBS)
+lib582_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib583_SOURCES = lib583.c $(SUPPORTFILES)
+lib583_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib585_SOURCES = lib500.c $(SUPPORTFILES) $(TESTUTIL) $(TSTTRACE)
 lib585_LDADD = $(TESTUTIL_LIBS)
 lib585_CPPFLAGS = $(AM_CPPFLAGS) -DLIB585
 
 lib586_SOURCES = lib586.c $(SUPPORTFILES)
+lib586_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib587_SOURCES = lib554.c $(SUPPORTFILES)
 lib587_CPPFLAGS = $(AM_CPPFLAGS) -DLIB587
 
 lib590_SOURCES = lib590.c $(SUPPORTFILES)
+lib590_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib591_SOURCES = lib591.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib591_LDADD = $(TESTUTIL_LIBS)
+lib591_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib597_SOURCES = lib597.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib597_LDADD = $(TESTUTIL_LIBS)
+lib597_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib598_SOURCES = lib598.c $(SUPPORTFILES)
+lib598_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib599_SOURCES = lib599.c $(SUPPORTFILES)
+lib599_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib1500_SOURCES = lib1500.c $(SUPPORTFILES) $(TESTUTIL)
 lib1500_LDADD = $(TESTUTIL_LIBS)
+lib1500_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib1501_SOURCES = lib1501.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib1501_LDADD = $(TESTUTIL_LIBS)
+lib1501_CPPFLAGS = $(AM_CPPFLAGS)
 
 lib1502_SOURCES = lib1502.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib1502_LDADD = $(TESTUTIL_LIBS)
diff --git a/tests/unit/Makefile.inc b/tests/unit/Makefile.inc
index 257e2a61c..c6d9d28c4 100644
--- a/tests/unit/Makefile.inc
+++ b/tests/unit/Makefile.inc
@@ -9,11 +9,29 @@ UNITPROGS = unit1300 unit1301 unit1302 unit1303 unit1304 unit1305 unit1307 \
  unit1308 unit1309
 
 unit1300_SOURCES = unit1300.c $(UNITFILES)
+unit1300_CPPFLAGS = $(AM_CPPFLAGS)
+
 unit1301_SOURCES = unit1301.c $(UNITFILES)
+unit1301_CPPFLAGS = $(AM_CPPFLAGS)
+
 unit1302_SOURCES = unit1302.c $(UNITFILES)
+unit1302_CPPFLAGS = $(AM_CPPFLAGS)
+
 unit1303_SOURCES = unit1303.c $(UNITFILES)
+unit1303_CPPFLAGS = $(AM_CPPFLAGS)
+
 unit1304_SOURCES = unit1304.c $(UNITFILES)
+unit1304_CPPFLAGS = $(AM_CPPFLAGS)
+
 unit1305_SOURCES = unit1305.c $(UNITFILES)
+unit1305_CPPFLAGS = $(AM_CPPFLAGS)
+
 unit1307_SOURCES = unit1307.c $(UNITFILES)
+unit1307_CPPFLAGS = $(AM_CPPFLAGS)
+
 unit1308_SOURCES = unit1308.c $(UNITFILES)
+unit1308_CPPFLAGS = $(AM_CPPFLAGS)
+
 unit1309_SOURCES = unit1309.c $(UNITFILES)
+unit1309_CPPFLAGS = $(AM_CPPFLAGS)
+