diff --git a/doc/examples/makefile.am b/doc/examples/makefile.am
index 7802369..3936de7 100644
--- a/doc/examples/makefile.am
+++ b/doc/examples/makefile.am
@@ -22,6 +22,7 @@ LDFLAGS += -ldl -lpthread -lssl -lcrypto
 endif
 
 pcsc_demo_SOURCES = pcsc-demo.cxx
+pcsc_demo_CPPFLAGS = -I${top_srcdir}/src
 pcsc_demo_LDFLAGS = -L${top_builddir}/src
 pcsc_demo_LDADD = -lpcscxx
 if MINGW32
@@ -29,6 +30,7 @@ pcsc_demo_LDADD += /opt/local/i586-mingw32msvc/lib/winscard.a
 endif
 
 cryptoki_demo_SOURCES = cryptoki-demo.cxx
+cryptoki_demo_CPPFLAGS = -I${top_srcdir}/src
 cryptoki_demo_LDADD = -lpcscxx
 cryptoki_demo_LDFLAGS = -L${top_builddir}/src
 if MINGW32
@@ -36,6 +38,7 @@ cryptoki_demo_LDADD += -leay32
 endif
 
 openssl_tcp_demo_SOURCES = openssl-tcp-demo.cxx
+openssl_tcp_demo_CPPFLAGS = -I${top_srcdir}/src
 openssl_tcp_demo_LDFLAGS = -L${top_builddir}/src
 openssl_tcp_demo_LDADD = -lpcscxx
 if MINGW32
@@ -43,6 +46,7 @@ openssl_tcp_demo_LDADD += /opt/local/i586-mingw32msvc/lib/ssleay32.a /opt/local/
 endif
 
 openssl_ssl_demo_SOURCES = openssl-ssl-demo.cxx
+openssl_ssl_demo_CPPFLAGS = -I${top_srcdir}/src
 openssl_ssl_demo_LDFLAGS = -L${top_builddir}/src
 openssl_ssl_demo_LDADD = -lpcscxx
 if MINGW32
@@ -50,6 +54,7 @@ openssl_ssl_demo_LDADD += /opt/local/i586-mingw32msvc/lib/ssleay32.a /opt/local/
 endif
 
 openssl_engine_demo_SOURCES = openssl-engine-demo.cxx
+openssl_engine_demo_CPPFLAGS = -I${top_srcdir}/src
 openssl_engine_demo_LDFLAGS = -L${top_builddir}/src
 openssl_engine_demo_LDADD = -lpcscxx
 if MINGW32