Apply this after configure.
This patch addresses following problems:
* No rpl_{re|m}alloc(3) emulation needed and it's provided neither
* <stdint.h> doesn't exist on IRIX
* statfs(2) has different API, use statvfs(2) instead
* setenv(3) doesn't exist on IRIX, emulate it using putenv(3)
* Old make doesn't support order-only prerequisites
* Underquoted shell variables (VER_GIT, VER_FILE) in Makefile

diff -Naur centerim-4.22.5/config.h centerim-4.22.5-irix/config.h
--- centerim-4.22.5/config.h	Wed Apr 30 21:50:20 2008
+++ centerim-4.22.5-irix/config.h	Wed Apr 30 18:06:37 2008
@@ -758,7 +758,7 @@
 #endif
 
 /* Define to rpl_malloc if the replacement function should be used. */
-#define malloc rpl_malloc
+/*#define malloc rpl_malloc*/
 
 /* Define to `int' if <sys/types.h> does not define. */
 /* #undef pid_t */
@@ -768,7 +768,7 @@
 /* #undef ptrdiff_t */
 
 /* Define to rpl_realloc if the replacement function should be used. */
-#define realloc rpl_realloc
+/*#define realloc rpl_realloc */
 
 /* Define to equivalent of C99 restrict keyword, or to nothing if this is not
    supported. Do not define if restrict is supported directly. */
diff -Naur centerim-4.22.5/kkconsui/src/texteditor.cc centerim-4.22.5-irix/kkconsui/src/texteditor.cc
--- centerim-4.22.5/kkconsui/src/texteditor.cc	Tue Apr 08 19:51:08 2008
+++ centerim-4.22.5-irix/kkconsui/src/texteditor.cc	Wed Apr 30 14:55:16 2008
@@ -43,7 +43,7 @@
 *
 */
 
-#include <stdint.h> /* for intptr_t */
+/*#include <stdint.h>*/ /* for intptr_t */
 
 #include "texteditor.h"
 
diff -Naur centerim-4.22.5/kkstrtext/kkstrtext.cc centerim-4.22.5-irix/kkstrtext/kkstrtext.cc
--- centerim-4.22.5/kkstrtext/kkstrtext.cc	Tue Apr 08 19:51:09 2008
+++ centerim-4.22.5-irix/kkstrtext/kkstrtext.cc	Wed Apr 30 14:52:24 2008
@@ -24,7 +24,7 @@
 
 #include "kkstrtext.h"
 #include <errno.h>
-#include <stdint.h> /* for intptr_t */
+/*#include <stdint.h>*/ /* for intptr_t */
 
 char *strcut(char *strin, int frompos, int count) {
     if(count > 0) {
diff -Naur centerim-4.22.5/src/icqconf.cc centerim-4.22.5-irix/src/icqconf.cc
--- centerim-4.22.5/src/icqconf.cc	Tue Apr 08 19:51:09 2008
+++ centerim-4.22.5-irix/src/icqconf.cc	Wed Apr 30 17:16:01 2008
@@ -27,7 +27,7 @@
 #include <dirent.h>
 #include <fstream>
 
-#if defined(__sun__) || defined(__NetBSD__)
+#if defined(__sun__) || defined(__NetBSD__) || defined(__sgi__)
 #include <sys/statvfs.h>
 #endif
 
@@ -1735,7 +1735,7 @@
 void icqconf::checkdiskspace() {
     fenoughdiskspace = true;
 
-#if !(defined(__sun__) || defined(__NetBSD__))
+#if !(defined(__sun__) || defined(__NetBSD__) || defined(__sgi__))
     struct statfs st;
     if(!statfs(conf.getdirname().c_str(), &st)) {
 #else
diff -Naur centerim-4.22.5/src/icqdialogs.cc centerim-4.22.5-irix/src/icqdialogs.cc
--- centerim-4.22.5/src/icqdialogs.cc	Tue Apr 08 19:51:09 2008
+++ centerim-4.22.5-irix/src/icqdialogs.cc	Wed Apr 30 15:52:09 2008
@@ -34,7 +34,7 @@
 #include "impgp.h"
 
 #include <libicq2000/constants.h>
-#include <stdint.h> /* for intptr_t */
+/*#include <stdint.h> *//* for intptr_t */
 
 const char *stragerange(ICQ2000::AgeRange r) {
     switch(r) {
diff -Naur centerim-4.22.5/src/icqface.cc centerim-4.22.5-irix/src/icqface.cc
--- centerim-4.22.5/src/icqface.cc	Tue Apr 08 19:51:09 2008
+++ centerim-4.22.5-irix/src/icqface.cc	Wed Apr 30 17:28:47 2008
@@ -22,7 +22,7 @@
 *
 */
 
-#include <stdint.h> /* for intptr_t */
+/*#include <stdint.h>*/ /* for intptr_t */
 
 #include "icqface.h"
 #include "icqconf.h"
diff -Naur centerim-4.22.5/src/imexternal.cc centerim-4.22.5-irix/src/imexternal.cc
--- centerim-4.22.5/src/imexternal.cc	Tue Apr 08 19:51:09 2008
+++ centerim-4.22.5-irix/src/imexternal.cc	Wed Apr 30 16:41:05 2008
@@ -252,6 +252,21 @@
     }
 }
 
+/* Emulation for IRIX which has no setenv(3)*/
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+int setenv(const char *name, const char *value, const int overwrite) {
+        char *buffer = NULL;
+        int size = strlen(name) + strlen(value) + 2;
+        if ((buffer = (char*)calloc(size, sizeof(char)))) {
+                snprintf(buffer, size, "%s=%s", name, value);
+                return putenv(buffer);
+        }
+        return -1;
+}
+
+
 int imexternal::action::execscript() {
     int inpipe[2], outpipe[2], pid;
     string text;
diff -Naur centerim-4.22.5/src/Makefile centerim-4.22.5-irix/src/Makefile
--- centerim-4.22.5/src/Makefile	Wed Apr 30 21:50:18 2008
+++ centerim-4.22.5-irix/src/Makefile	Wed Apr 30 17:50:47 2008
@@ -1064,13 +1064,13 @@
 	uninstall-binPROGRAMS
 
 
-$(centerim_OBJECTS) git-version.h : | git_version
+$(centerim_OBJECTS) git-version.h : git_version
 .PHONY: git_version
 
 git_version: git-version.h.in
 	VER_FILE=`$(g_get_cur)` || true; \
 	VER_GIT=`cd $(top_srcdir); ./misc/git-version-gen .version`; \
-	if [ -z $$VER_FILE ] || [ $$VER_FILE != $$VER_GIT ]; then \
+	if [ -z "$$VER_FILE" ] || [ "$$VER_FILE" != "$$VER_GIT" ]; then \
 		$(g_subst_f); \
 	fi
 # Tell versions [3.59,3.63) of GNU make to not export all variables.