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On a Linux-x86 system with 2.6.27.25 kernel:

/home/me/SDL2-2.0.5/src/core/linux/SDL_evdev.c: In function 'SDL_EVDEV_Poll':
/home/me/SDL2-2.0.5/src/core/linux/SDL_evdev.c:454: error: 'ABS_MT_SLOT' undeclared (first use in this function)
/home/me/SDL2-2.0.5/src/core/linux/SDL_evdev.c:454: error: (Each undeclared identifier is reported only once
/home/me/SDL2-2.0.5/src/core/linux/SDL_evdev.c:454: error: for each function it appears in.)
/home/me/SDL2-2.0.5/src/core/linux/SDL_evdev.c:459: error: 'ABS_MT_TRACKING_ID' undeclared (first use in this function)
/home/me/SDL2-2.0.5/src/core/linux/SDL_evdev.c:469: error: 'ABS_MT_POSITION_X' undeclared (first use in this function)
/home/me/SDL2-2.0.5/src/core/linux/SDL_evdev.c:477: error: 'ABS_MT_POSITION_Y' undeclared (first use in this function)


Applying the following makes it compile:

diff -r fbf9b0e3589a src/core/linux/SDL_evdev.c
--- a/src/core/linux/SDL_evdev.c	Sat Oct 22 17:53:03 2016 -0700
+++ b/src/core/linux/SDL_evdev.c	Thu Oct 27 19:54:15 2016 +0200
@@ -57,6 +57,14 @@
 #define SYN_DROPPED 3
 #endif
 
+/* These are not defined in older Linux kernel headers. */
+#ifndef ABS_MT_SLOT
+#define ABS_MT_SLOT         0x2f
+#define ABS_MT_POSITION_X   0x35
+#define ABS_MT_POSITION_Y   0x36
+#define ABS_MT_TRACKING_ID  0x39
+#endif
+
 typedef struct SDL_evdevlist_item
 {
     char *path;