diff --git a/src/dedicated/i_system.c b/src/dedicated/i_system.c
index 23c0149ca..87a8a8033 100644
--- a/src/dedicated/i_system.c
+++ b/src/dedicated/i_system.c
@@ -65,9 +65,9 @@ typedef LPVOID (WINAPI *p_MapViewOfFile) (HANDLE, DWORD, DWORD, DWORD, SIZE_T);
 #pragma warning(default : 4214 4244)
 #endif
 
-#if defined (__unix__) || defined(__APPLE__) || (defined (UNIXCOMMON) && !defined (__HAIKU__))
-#if defined (__linux__)
-#include <sys/vfs.h>
+#if defined (__unix__) || defined(__APPLE__) || defined (UNIXCOMMON)
+#if defined (__linux__) || defined (__HAIKU__)
+#include <sys/statvfs.h>
 #else
 #include <sys/param.h>
 #include <sys/mount.h>
@@ -81,7 +81,7 @@ typedef LPVOID (WINAPI *p_MapViewOfFile) (HANDLE, DWORD, DWORD, DWORD, SIZE_T);
 #endif
 #endif
 
-#if defined (__linux__) || (defined (UNIXCOMMON) && !defined (__HAIKU__))
+#if defined (__linux__) || defined (UNIXCOMMON)
 #ifndef NOTERMIOS
 #include <termios.h>
 #include <sys/ioctl.h> // ioctl
@@ -96,8 +96,10 @@ typedef LPVOID (WINAPI *p_MapViewOfFile) (HANDLE, DWORD, DWORD, DWORD, SIZE_T);
 #if defined (__unix__) || (defined (UNIXCOMMON) && !defined (__APPLE__))
 #include <errno.h>
 #include <sys/wait.h>
+#ifndef __HAIKU__ // haiku's crash dialog is just objectively better
 #define NEWSIGNALHANDLER
 #endif
+#endif
 
 #ifndef NOMUMBLE
 #ifdef __linux__ // need -lrt
@@ -374,7 +376,7 @@ void I_Sleep(UINT32 ms)
 
 void I_SleepDuration(precise_t duration)
 {
-#if defined(__linux__) || defined(__FreeBSD__)
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__HAIKU__)
 	UINT64 precision = I_GetPrecisePrecision();
 	struct timespec ts = {
 		.tv_sec = duration / precision,
@@ -1226,18 +1228,13 @@ void I_ShutdownSystem(void)
 void I_GetDiskFreeSpace(INT64* freespace)
 {
 #if defined (__unix__) || defined(__APPLE__) || defined (UNIXCOMMON)
-#if defined (SOLARIS) || defined (__HAIKU__)
-	*freespace = INT32_MAX;
-	return;
-#else // Both Linux and BSD have this, apparently.
-	struct statfs stfs;
-	if (statfs(srb2home, &stfs) == -1)
+	struct statvfs stfs;
+	if (statvfs(srb2home, &stfs) == -1)
 	{
 		*freespace = INT32_MAX;
 		return;
 	}
 	*freespace = stfs.f_bavail * stfs.f_bsize;
-#endif
 #elif defined (_WIN32)
 	static p_GetDiskFreeSpaceExA pfnGetDiskFreeSpaceEx = NULL;
 	static boolean testwin95 = false;
diff --git a/src/sdl/i_system.c b/src/sdl/i_system.c
index 07088b957..f787bbfbd 100644
--- a/src/sdl/i_system.c
+++ b/src/sdl/i_system.c
@@ -78,9 +78,9 @@ typedef LPVOID (WINAPI *p_MapViewOfFile) (HANDLE, DWORD, DWORD, DWORD, SIZE_T);
 #include "SDL_cpuinfo.h"
 #define HAVE_SDLCPUINFO
 
-#if defined (__unix__) || defined(__APPLE__) || (defined (UNIXCOMMON) && !defined (__HAIKU__))
-#if defined (__linux__)
-#include <sys/vfs.h>
+#if defined (__unix__) || defined(__APPLE__) || defined (UNIXCOMMON)
+#if defined (__linux__) || defined (__HAIKU__)
+#include <sys/statvfs.h>
 #else
 #include <sys/param.h>
 #include <sys/mount.h>
@@ -94,7 +94,7 @@ typedef LPVOID (WINAPI *p_MapViewOfFile) (HANDLE, DWORD, DWORD, DWORD, SIZE_T);
 #endif
 #endif
 
-#if defined (__linux__) || (defined (UNIXCOMMON) && !defined (__HAIKU__))
+#if defined (__linux__) || defined (UNIXCOMMON)
 #ifndef NOTERMIOS
 #include <termios.h>
 #include <sys/ioctl.h> // ioctl
@@ -109,8 +109,10 @@ typedef LPVOID (WINAPI *p_MapViewOfFile) (HANDLE, DWORD, DWORD, DWORD, SIZE_T);
 #if defined (__unix__) || (defined (UNIXCOMMON) && !defined (__APPLE__))
 #include <errno.h>
 #include <sys/wait.h>
+#ifndef __HAIKU__ // haiku's crash dialog is just objectively better
 #define NEWSIGNALHANDLER
 #endif
+#endif
 
 #ifndef NOMUMBLE
 #ifdef __linux__ // need -lrt
@@ -2754,18 +2756,13 @@ void I_ShutdownSystem(void)
 void I_GetDiskFreeSpace(INT64 *freespace)
 {
 #if defined (__unix__) || defined(__APPLE__) || defined (UNIXCOMMON)
-#if defined (SOLARIS) || defined (__HAIKU__)
-	*freespace = INT32_MAX;
-	return;
-#else // Both Linux and BSD have this, apparently.
-	struct statfs stfs;
-	if (statfs(srb2home, &stfs) == -1)
+	struct statvfs stfs;
+	if (statvfs(srb2home, &stfs) == -1)
 	{
 		*freespace = INT32_MAX;
 		return;
 	}
 	*freespace = stfs.f_bavail * stfs.f_bsize;
-#endif
 #elif defined (_WIN32)
 	static p_GetDiskFreeSpaceExA pfnGetDiskFreeSpaceEx = NULL;
 	static boolean testwin95 = false;