diff --git a/Xext/shm.c b/Xext/shm.c
index 376f12348..3c0d1eef0 100644
--- a/Xext/shm.c
+++ b/Xext/shm.c
@@ -154,7 +154,7 @@ static ShmFuncs fbFuncs = {fbShmCreatePixmap, fbShmPutImage};
 }
 
 
-#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__CYGWIN__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__CYGWIN__) || defined(__DragonFly__)
 #include <sys/signal.h>
 
 static Bool badSysCall = FALSE;
diff --git a/Xext/xf86bigfont.c b/Xext/xf86bigfont.c
index f50481f78..c2f891a7e 100644
--- a/Xext/xf86bigfont.c
+++ b/Xext/xf86bigfont.c
@@ -104,7 +104,7 @@ static unsigned int pagesize;
 
 static Bool badSysCall = FALSE;
 
-#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__CYGWIN__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__CYGWIN__) || defined(__DragonFly__)
 
 #include <sys/signal.h>
 
diff --git a/hw/xfree86/loader/os.c b/hw/xfree86/loader/os.c
index fdddce898..12cf3d859 100644
--- a/hw/xfree86/loader/os.c
+++ b/hw/xfree86/loader/os.c
@@ -42,6 +42,8 @@
 #define OSNAME "linux"
 #elif defined(__FreeBSD__)
 #define OSNAME "freebsd"
+#elif defined(__DragonFly__)
+#define OSNAME "dragonfly"
 #elif defined(__NetBSD__)
 #define OSNAME "netbsd"
 #elif defined(__OpenBSD__)
diff --git a/hw/xfree86/os-support/bus/Pci.h b/hw/xfree86/os-support/bus/Pci.h
index f0cb916da..5ebbdd55e 100644
--- a/hw/xfree86/os-support/bus/Pci.h
+++ b/hw/xfree86/os-support/bus/Pci.h
@@ -235,7 +235,7 @@
 # if defined(linux)
 #  define ARCH_PCI_INIT axpPciInit
 #  define INCLUDE_XF86_MAP_PCI_MEM
-# elif defined(__FreeBSD__) || defined(__OpenBSD__)
+# elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
 #  define ARCH_PCI_INIT freebsdPciInit
 #  define INCLUDE_XF86_MAP_PCI_MEM
 #  define INCLUDE_XF86_NO_DOMAIN
diff --git a/hw/xfree86/os-support/bus/freebsdPci.c b/hw/xfree86/os-support/bus/freebsdPci.c
index 61cb405a8..63c00b262 100644
--- a/hw/xfree86/os-support/bus/freebsdPci.c
+++ b/hw/xfree86/os-support/bus/freebsdPci.c
@@ -83,7 +83,7 @@ static pciBusInfo_t freebsdPci0 = {
 /* bridge      */	NULL
 };
 
-#if !defined(__OpenBSD__) && !defined(__FreeBSD__)
+#if !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__DragonFly__)
 #if X_BYTE_ORDER == X_BIG_ENDIAN
 #ifdef __sparc__
 #ifndef ASI_PL