diff --git a/ccid/configure.ac b/ccid/configure.ac
index f331df2..153e8b0 100644
--- a/ccid/configure.ac
+++ b/ccid/configure.ac
@@ -16,6 +16,7 @@ AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_LIBTOOL
 AM_PROG_CC_C_O
+AC_PROG_SED
 PKG_PROG_PKG_CONFIG
 AC_PATH_PROG(HELP2MAN, help2man, false // No help2man //)
 AC_PATH_PROG(GENGETOPT, gengetopt, false // No gengetopt //)
diff --git a/ccid/doc/Makefile.am b/ccid/doc/Makefile.am
index 9fc9aad..ece80c5 100644
--- a/ccid/doc/Makefile.am
+++ b/ccid/doc/Makefile.am
@@ -1,4 +1,4 @@
-do_subst = sed \
+do_subst = $(SED) \
 	   -e 's,[@]PACKAGE[@],$(PACKAGE),g' \
 	   -e 's,[@]PACKAGE_NAME[@],$(PACKAGE_NAME),g' \
 	   -e 's,[@]PACKAGE_TARNAME[@],$(PACKAGE_TARNAME),g' \
diff --git a/ccid/src/Makefile.am b/ccid/src/Makefile.am
index 25fdf96..7ee9b45 100644
--- a/ccid/src/Makefile.am
+++ b/ccid/src/Makefile.am
@@ -1,4 +1,4 @@
-do_subst = sed \
+do_subst = $(SED) \
 	   -e 's,[@]PACKAGE[@],$(PACKAGE),g' \
 	   -e 's,[@]PACKAGE_NAME[@],$(PACKAGE_NAME),g' \
 	   -e 's,[@]PACKAGE_TARNAME[@],$(PACKAGE_TARNAME),g' \
diff --git a/npa/doc/Makefile.am b/npa/doc/Makefile.am
index f25e105..fc1c31d 100644
--- a/npa/doc/Makefile.am
+++ b/npa/doc/Makefile.am
@@ -1,6 +1,6 @@
 DOXYGEN ?= doxygen
 
-do_subst = sed \
+do_subst = $(SED) \
 	   -e 's,[@]PACKAGE[@],$(PACKAGE),g' \
 	   -e 's,[@]PACKAGE_NAME[@],$(PACKAGE_NAME),g' \
 	   -e 's,[@]PACKAGE_TARNAME[@],$(PACKAGE_TARNAME),g' \
diff --git a/npa/src/Makefile.am b/npa/src/Makefile.am
index 90789a3..5c9314e 100644
--- a/npa/src/Makefile.am
+++ b/npa/src/Makefile.am
@@ -1,4 +1,4 @@
-do_subst = sed \
+do_subst = $(SED) \
 	   -e 's,[@]PACKAGE[@],$(PACKAGE),g' \
 	   -e 's,[@]PACKAGE_NAME[@],$(PACKAGE_NAME),g' \
 	   -e 's,[@]PACKAGE_TARNAME[@],$(PACKAGE_TARNAME),g' \
diff --git a/pcsc-relay/configure.ac b/pcsc-relay/configure.ac
index c8ada04..6d166b7 100644
--- a/pcsc-relay/configure.ac
+++ b/pcsc-relay/configure.ac
@@ -11,6 +11,7 @@ AM_INIT_AUTOMAKE
 AC_PROG_CC
 AM_PROG_CC_C_O
 AM_PATH_PYTHON
+AC_PROG_SED
 PKG_PROG_PKG_CONFIG
 AC_PATH_PROG(HELP2MAN, help2man, false // No help2man //)
 AC_PATH_PROG(GENGETOPT, gengetopt, false // No gengetopt //)
diff --git a/pcsc-relay/doc/Makefile.am b/pcsc-relay/doc/Makefile.am
index c4320d7..8d88b88 100644
--- a/pcsc-relay/doc/Makefile.am
+++ b/pcsc-relay/doc/Makefile.am
@@ -1,4 +1,4 @@
-do_subst = sed \
+do_subst = $(SED) \
 	   -e 's,[@]PACKAGE[@],$(PACKAGE),g' \
 	   -e 's,[@]PACKAGE_NAME[@],$(PACKAGE_NAME),g' \
 	   -e 's,[@]PACKAGE_TARNAME[@],$(PACKAGE_TARNAME),g' \
diff --git a/pcsc-relay/src/Makefile.am b/pcsc-relay/src/Makefile.am
index a2d098e..3f25e7e 100644
--- a/pcsc-relay/src/Makefile.am
+++ b/pcsc-relay/src/Makefile.am
@@ -1,4 +1,4 @@
-do_subst = sed \
+do_subst = $(SED) \
 	   -e 's,[@]PACKAGE[@],$(PACKAGE),g' \
 	   -e 's,[@]PACKAGE_NAME[@],$(PACKAGE_NAME),g' \
 	   -e 's,[@]PACKAGE_TARNAME[@],$(PACKAGE_TARNAME),g' \
diff --git a/virtualsmartcard/doc/Makefile.am b/virtualsmartcard/doc/Makefile.am
index 77601cd..a96b626 100644
--- a/virtualsmartcard/doc/Makefile.am
+++ b/virtualsmartcard/doc/Makefile.am
@@ -1,6 +1,6 @@
 SUBDIRS = api
 
-do_subst = sed \
+do_subst = $(SED) \
 	   -e 's,[@]PACKAGE_NAME[@],$(PACKAGE_NAME),g' \
 	   -e 's,[@]PACKAGE_TARNAME[@],$(PACKAGE_TARNAME),g' \
 	   -e 's,[@]PACKAGE_BUGREPORT[@],$(PACKAGE_BUGREPORT),g' \