diff -ruwN source-old/include/drm/drm.h source/include/drm/drm.h
--- source-old/include/drm/drm.h	2025-06-08 06:27:53.000000000 -0600
+++ source/include/drm/drm.h	2025-10-30 17:17:33.654234959 -0600
@@ -44,7 +44,11 @@
 #else /* One of the BSDs */
 
 #include <stdint.h>
+#if defined(__redox__)
+#include <sys/ioctl.h>
+#else
 #include <sys/ioccom.h>
+#endif
 #include <sys/types.h>
 typedef int8_t   __s8;
 typedef uint8_t  __u8;
diff -ruwN source-old/xf86drm.c source/xf86drm.c
--- source-old/xf86drm.c	2025-06-08 06:27:53.000000000 -0600
+++ source/xf86drm.c	2025-10-30 17:18:58.374958567 -0600
@@ -57,6 +57,19 @@
 #ifdef MAJOR_IN_SYSMACROS
 #include <sys/sysmacros.h>
 #endif
+#if defined(__redox__)
+// From musl sys/sysmacros.h
+#define major(x) \
+	((unsigned)( (((x)>>31>>1) & 0xfffff000) | (((x)>>8) & 0x00000fff) ))
+#define minor(x) \
+	((unsigned)( (((x)>>12) & 0xffffff00) | ((x) & 0x000000ff) ))
+
+#define makedev(x,y) ( \
+        (((x)&0xfffff000ULL) << 32) | \
+	(((x)&0x00000fffULL) << 8) | \
+        (((y)&0xffffff00ULL) << 12) | \
+	(((y)&0x000000ffULL)) )
+#endif
 #if HAVE_SYS_SYSCTL_H
 #include <sys/sysctl.h>
 #endif
@@ -304,9 +317,14 @@
     char *modifier_name = NULL;
     bool result = false;
 
+#if defined(__redox__)
+    fprintf(stderr, "open_memstream not available on Redox\n");
+    return NULL;
+#else
     fp = open_memstream(&modifier_name, &size);
     if (!fp)
         return NULL;
+#endif
 
     switch (type) {
     case DRM_FORMAT_MOD_ARM_TYPE_AFBC:
@@ -409,9 +427,14 @@
     char *mod_amd = NULL;
     size_t size = 0;
 
+#if defined(__redox__)
+    fprintf(stderr, "open_memstream not available on Redox\n");
+    return NULL;
+#else
     fp = open_memstream(&mod_amd, &size);
     if (!fp)
         return NULL;
+#endif
 
     switch (tile_version) {
     case AMD_FMT_MOD_TILE_VER_GFX9:
@@ -3657,7 +3657,7 @@ static int drmParseSubsystemType(int maj, int min)
             return DRM_BUS_VIRTIO;
      }
     return subsystem_type;
-#elif defined(__OpenBSD__) || defined(__DragonFly__) || defined(__FreeBSD__)
+#elif defined(__OpenBSD__) || defined(__DragonFly__) || defined(__FreeBSD__) || defined(__redox__)
     return DRM_BUS_PCI;
 #else
 #warning "Missing implementation of drmParseSubsystemType"
@@ -3791,6 +3791,8 @@ static int drmParsePciBusInfo(int maj, int min, drmPciBusInfoPtr info)
     return 0;
 #elif defined(__FreeBSD__)
     return get_sysctl_pci_bus_info(maj, min, info);
+#elif defined(__redox__)
+    return 0; // FIXME maybe parse DRM_IOCTL_GET_UNIQUE?
 #else
 #warning "Missing implementation of drmParsePciBusInfo"
     return -EINVAL;
@@ -4000,6 +4002,8 @@ static int drmParsePciDeviceInfo(int maj, int min,
     device->revision_id = results[0].pc_revid;
 
     return 0;
+#elif defined(__redox__)
+    return 0; // FIXME get this info somehow?
 #else
 #warning "Missing implementation of drmParsePciDeviceInfo"
     return -EINVAL;
@@ -4511,8 +4515,11 @@ process_device(drmDevicePtr *device, const char *d_name,
     maj = major(sbuf.st_rdev);
     min = minor(sbuf.st_rdev);
 
+    // Doesn't work on Redox as /dev/dri/cardN is a symlink
+#ifndef __redox__
     if (!drmNodeIsDRM(maj, min) || !S_ISCHR(sbuf.st_mode))
         return -1;
+#endif
 
     subsystem_type = drmParseSubsystemType(maj, min);
     if (req_subsystem_type != -1 && req_subsystem_type != subsystem_type)
diff -ruwN source-old/xf86drm.h source/xf86drm.h
--- source-old/xf86drm.h	2025-06-08 06:27:53.000000000 -0600
+++ source/xf86drm.h	2025-10-30 17:17:33.655115281 -0600
@@ -47,7 +47,7 @@
 #define DRM_MAX_MINOR   64 /* deprecated */
 #endif
 
-#if defined(__linux__)
+#if defined(__linux__) || defined(__redox__)
 
 #define DRM_IOCTL_NR(n)		_IOC_NR(n)
 #define DRM_IOC_VOID		_IOC_NONE
