diff --git a/Makefile b/Makefile
index a10eb5214..c706d429c 100644
--- a/Makefile
+++ b/Makefile
@@ -65,6 +65,15 @@ ifeq ($(PLAT),sunos)
 	BUILD_DIR = build-solaris
 endif
 
+ifeq ($(PLAT),hp-ux)
+	CC      =  gcc
+	CFLAGS  = -DCC_BUILD_ICON
+	LDFLAGS =
+	LIBS    = -lm -lX11 -lXi -L/opt/graphics/OpenGL/lib -lGL
+	BUILD_DIR = build-hpux
+	TRACK_DEPENDENCIES=0
+endif
+
 ifeq ($(PLAT),darwin)
 	OBJECTS += $(BUILD_DIR)/Window_cocoa.o
 	CFLAGS  += -DCC_BUILD_ICON
@@ -175,6 +184,8 @@ mingw:
 	$(MAKE) $(TARGET) PLAT=mingw
 sunos:
 	$(MAKE) $(TARGET) PLAT=sunos
+hp-ux:
+	$(MAKE) $(TARGET) PLAT=hp-ux
 darwin:
 	$(MAKE) $(TARGET) PLAT=darwin
 freebsd:
diff --git a/src/Core.h b/src/Core.h
index e342c64f8..b56bdb171 100644
--- a/src/Core.h
+++ b/src/Core.h
@@ -265,6 +265,13 @@ typedef cc_uint8  cc_bool;
 	#define DEFAULT_AUD_BACKEND CC_AUD_BACKEND_OPENAL
 	#define DEFAULT_GFX_BACKEND CC_GFX_BACKEND_GL1
 	#define DEFAULT_WIN_BACKEND CC_WIN_BACKEND_X11
+#elif defined __hpux
+	#define CC_BUILD_HPUX
+	#define CC_BUILD_POSIX
+	#define DEFAULT_NET_BACKEND CC_NET_BACKEND_LIBCURL
+	#define DEFAULT_AUD_BACKEND CC_AUD_BACKEND_OPENAL
+	#define DEFAULT_GFX_BACKEND CC_GFX_BACKEND_GL1
+	#define DEFAULT_WIN_BACKEND CC_WIN_BACKEND_X11
 #elif defined __FreeBSD__ || defined __DragonFly__
 	#define CC_BUILD_FREEBSD
 	#define CC_BUILD_POSIX
diff --git a/src/Platform_Posix.c b/src/Platform_Posix.c
index c89afc402..fa7b6b3f3 100644
--- a/src/Platform_Posix.c
+++ b/src/Platform_Posix.c
@@ -175,7 +175,7 @@ cc_uint64 Stopwatch_ElapsedMicroseconds(cc_uint64 beg, cc_uint64 end) {
 /* "... These functions are part of the Timers option and need not be available on all implementations..." */
 cc_uint64 Stopwatch_Measure(void) {
 	struct timespec t;
-	#ifdef CC_BUILD_IRIX
+	#if defined CC_BUILD_IRIX || defined CC_BUILD_HPUX
 	clock_gettime(CLOCK_REALTIME, &t);
 	#else
 	/* TODO: CLOCK_MONOTONIC_RAW ?? */
@@ -247,7 +247,7 @@ cc_result Directory_Enum(const cc_string* dirPath, void* obj, Directory_EnumCall
 		len = String_Length(src);
 		String_AppendUtf8(&path, src, len);
 
-#if defined CC_BUILD_HAIKU || defined CC_BUILD_SOLARIS || defined CC_BUILD_IRIX || defined CC_BUILD_BEOS
+#if defined CC_BUILD_HAIKU || defined CC_BUILD_SOLARIS || defined CC_BUILD_HPUX || defined CC_BUILD_IRIX || defined CC_BUILD_BEOS
 		{
 			char full_path[NATIVE_STR_LEN];
 			struct stat sb;
@@ -996,7 +996,7 @@ static cc_result Process_RawGetExePath(char* path, int* len) {
 	Mem_Copy(path, info.name, *len);
 	return 0;
 }
-#elif defined CC_BUILD_IRIX
+#elif defined CC_BUILD_IRIX || defined CC_BUILD_HPUX
 static cc_result Process_RawGetExePath(char* path, int* len) {
 	static cc_string file = String_FromConst("ClassiCube");
 
@@ -1235,7 +1235,7 @@ static void Platform_InitPosix(void) {
 }
 void Platform_Free(void) { }
 
-#ifdef CC_BUILD_IRIX
+#if defined CC_BUILD_IRIX || defined CC_BUILD_HPUX
 cc_bool Platform_DescribeError(cc_result res, cc_string* dst) {
 	const char* err = strerror(res);
 	if (!err || res >= 1000) return false;
diff --git a/src/Window_X11.c b/src/Window_X11.c
index 3ab1edd3e..6a270e1fe 100644
--- a/src/Window_X11.c
+++ b/src/Window_X11.c
@@ -54,6 +54,9 @@
 /* XIM support based off details described in */
 /* https://tedyin.com/posts/a-brief-intro-to-linux-input-method-framework/ */
 #endif
+#ifdef CC_BUILD_HPUX
+#undef CC_BUILD_XIM
+#endif
 
 #define _NET_WM_STATE_REMOVE 0
 #define _NET_WM_STATE_ADD    1