Remember to use the CFLAGS pkg-config gave us.

bin/otpkey/Makefile.am

@@ -1,8 +1,16 @@
 AM_CPPFLAGS = -I$(top_srcdir)/include
 
+libotp = $(top_builddir)/lib/otp/libcryb-otp.la
+
 bin_PROGRAMS = otpkey
 
 otpkey_SOURCES = otpkey.c
+
+otpkey_CFLAGS = \
+	$(CRYB_CORE_CFLAGS)
+
+otpkey_LDADD = $(libotp)
+
 dist_man1_MANS = otpkey.1
 
 if WITH_SETUID

lib/otp/Makefile.am

@@ -6,6 +6,10 @@ libcryb_otp_la_SOURCES = \
 	\
 	cryb_otp.c
 
+libcryb_otp_la_CFLAGS = \
+	 $(CRYB_CORE_CFLAGS) \
+	 $(CRYB_OATH_CFLAGS)
+
 libcryb_otp_la_LIBADD = \
 	$(CRYB_CORE_LIBS) \
 	$(CRYB_OATH_LIBS)

libexec/login_otp/Makefile.am

@@ -5,6 +5,10 @@ libotp = $(top_builddir)/lib/otp/libcryb-otp.la
 libexec_PROGRAMS = login_otp
 
 login_otp_SOURCES = login_otp.c
+
+login_otp_CFLAGS = \
+	$(CRYB_CORE_CFLAGS)
+
 login_otp_LDADD = $(libotp)
 
 dist_man8_MANS = login_otp.8

pam/pam_otp/Makefile.am

@@ -6,9 +6,15 @@ moduledir = $(libdir)
 module_LTLIBRARIES = pam_otp.la
 
 pam_otp_la_SOURCES = pam_otp.c
+
+pam_otp_la_CFLAGS = \
+	$(CRYB_CORE_CFLAGS)
+
 pam_otp_la_LIBADD = \
 	$(libotp) \
 	$(PAM_LIBS)
-pam_otp_la_LDFLAGS = -no-undefined -module -export-symbols-regex '^pam_sm_'
+
+pam_otp_la_LDFLAGS = \
+	-no-undefined -module -export-symbols-regex '^pam_sm_'
 
 dist_man8_MANS = pam_otp.8

sbin/otpradiusd/Makefile.am

@@ -1,6 +1,14 @@
 AM_CPPFLAGS = -I$(top_srcdir)/include
 
+libotp = $(top_builddir)/lib/otp/libcryb-otp.la
+
 sbin_PROGRAMS = otpradiusd
 
 otpradiusd_SOURCES = otpradiusd.c
+
+otpradiusd_CFLAGS = \
+	$(CRYB_CORE_CFLAGS)
+
+otpradiusd_LDADD = $(libotp)
+
 dist_man8_MANS = otpradiusd.8

t/Makefile.am

@@ -12,7 +12,7 @@ TESTS =
 # c++ header test
 TESTS += t_cxx
 t_cxx_SOURCES = t_cxx.cc
-t_cxx_CPPFLAGS = $(AM_CPPFLAGS)
+t_cxx_CPPFLAGS = $(AM_CPPFLAGS) $(CRYB_CORE_CFLAGS)
 t_cxx_LDADD =
 if OTP_LIB
 t_cxx_CPPFLAGS += -DWITH_OTP_LIB