diff --git a/configure b/configure
index fa391f2..6e8660d 100755
--- a/configure
+++ b/configure
@@ -4,19 +4,22 @@ OS=`uname -s`
 DEBUG=0
 PREFIX=/usr/local
 
-create_generic_config_h() {
-    cat <<EOF > src/config.h
-#ifndef _CONFIG_H
-#define _CONFIG_H
+config_h_append_generic_endian() {
+    cat <<EOF >> "$1"
+
+/*
+ * Generic compatibility
+ */
 #include <endian.h>
-#endif /* _CONFIG_H */
 EOF
 }
 
-create_darwin_config_h() {
-    cat <<EOF > src/config.h
-#ifndef _CONFIG_H
-#define _CONFIG_H
+config_h_append_darwin_endian() {
+    cat <<EOF >> "$1"
+
+/*
+ * Darwin compatibility
+ */
 #include <libkern/OSByteOrder.h>
 
 #define htobe16(n) OSSwapHostToBigInt16(n)
@@ -33,32 +36,55 @@ create_darwin_config_h() {
 #define htole64(n) OSSwapHostToLittleInt64(n)
 #define be64toh(n) OSSwapBigToHostInt64(n)
 #define le64toh(n) OSSwapLittleToHostInt64(n)
+EOF
+}
+
+config_h_append_bsd_pty() {
+    cat <<EOF >> "$1"
+
+/*
+ * BSD openpty(3) compatibility
+ */
+#include <util.h>
+EOF
+}
+
+config_h_append_linux_pty() {
+    cat <<EOF >> "$1"
+
+/*
+ * Linux openpty(3) compatibility
+ */
+#include <pty.h>
+EOF
+}
+
+config_h_create() {
+    cat <<EOF > "$1"
+#ifndef _CONFIG_H
+#define _CONFIG_H
+EOF
+
+    if [ "$OS" = "Darwin" ]; then
+        config_h_append_darwin_endian "$1"
+    else
+        config_h_append_generic_endian "$1"
+    fi
+
+    if [ "$OS" = "Linux" ]; then
+        config_h_append_linux_pty "$1"
+    else
+        config_h_append_bsd_pty "$1"
+    fi
+
+    cat <<EOF >> "$1"
+
 #endif /* _CONFIG_H */
 EOF
 }
 
-create_common_build_mk() {
-    if [ "$DEBUG" = 1 ]; then
-        cat <<'EOF' > mk/build.mk
-CGFLAGS		= -g -fno-inline
-EOF
-	else
-		cat <<'EOF' > mk/build.mk
-CGFLAGS		=
-EOF
-    fi
-
-	cat <<'EOF' >> mk/build.mk
-CWFLAGS		= -Wall
-COFLAGS		= -O2
-CFLAGS		= $(CGFLAGS) $(CWFLAGS) $(COFLAGS)
-EOF
-}
-
-create_generic_build_mk() {
-    create_common_build_mk $@
-
-    cat <<'EOF' >> mk/build.mk
+build_mk_append_generic() {
+    cat <<'EOF' >> "$1"
 LLFLAGS		= -shared -Wl,-soname=$(SONAME)
 
 STATIC		= lib$(LIBNAME).a
@@ -74,8 +100,8 @@ PREFIX      = $PREFIX
 EOF
 }
 
-create_darwin_build_mk() {
-    create_common_build_mk $@
+build_mk_append_darwin() {
+    build_mk_create_common $@
 
     cat <<'EOF' >> mk/build.mk
 LLFLAGS		= -dynamiclib -current_version $(VERSION)
@@ -93,6 +119,30 @@ PREFIX      = $PREFIX
 EOF
 }
 
+build_mk_create() {
+    if [ "$DEBUG" = 1 ]; then
+        cat <<'EOF' > "$1"
+CGFLAGS		= -g -fno-inline
+EOF
+	else
+		cat <<'EOF' > "$1"
+CGFLAGS		=
+EOF
+    fi
+
+    if [ "$OS" = "Darwin" ]; then
+        build_mk_append_darwin "$1"
+    else
+        build_mk_append_generic "$1"
+    fi
+
+	cat <<'EOF' >> mk/build.mk
+CWFLAGS		= -Wall
+COFLAGS		= -O2
+CFLAGS		= $(CGFLAGS) $(CWFLAGS) $(COFLAGS)
+EOF
+}
+
 for arg in $@; do
     case $arg in
         "--enable-debug")
@@ -105,14 +155,5 @@ if [ ! -d "mk" ]; then
     mkdir -m 0755 mk
 fi
 
-case $OS in
-    Darwin)
-        create_darwin_config_h
-		create_darwin_build_mk
-    ;;
-
-    *)
-        create_generic_config_h
-		create_generic_build_mk
-    ;;
-esac
+config_h_create "src/config.h"
+build_mk_create "src/build.mk"
diff --git a/examples/daemon.c b/examples/daemon.c
index 72197ba..1d29cbc 100644
--- a/examples/daemon.c
+++ b/examples/daemon.c
@@ -3,7 +3,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>
-#include <util.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -13,6 +12,8 @@
 #include <patty/ax25.h>
 #include <patty/daemon.h>
 
+#include "../src/config.h"
+
 static void usage(int argc, char **argv, const char *message, ...) {
     if (message != NULL) {
         va_list args;
diff --git a/src/sock.c b/src/sock.c
index bb6b974..219b6ab 100644
--- a/src/sock.c
+++ b/src/sock.c
@@ -2,7 +2,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <util.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
@@ -12,6 +11,8 @@
 
 #include <patty/ax25.h>
 
+#include "config.h"
+
 struct slot {
     size_t len;
     int ack;