diff --git a/ChangeLog b/ChangeLog
index effde73165..e3288b4682 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Tue Aug  8 11:32:54 2006  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* Makefile.in, common.mk, configure.in: fix for platforms without
+	  rm. patches from Yutaka kanemoto <kinpoco at gmail.com>.
+	  [ruby-dev:29215]
+
 Mon Aug  7 17:56:59 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* ext/bigdecimal/bigdecimal.c, ext/digest/rmd160/rmd160ossl.c,
diff --git a/Makefile.in b/Makefile.in
index 2b050bf095..254f1656ee 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -85,6 +85,7 @@ ASFLAGS       = @ASFLAGS@
 OBJEXT        = @OBJEXT@
 MANTYPE	      = @MANTYPE@
 
+PREINSTALL    = @PREINSTALL@
 #### End of variables
 
 all:
diff --git a/common.mk b/common.mk
index dfc0e98cf7..cf3e959566 100644
--- a/common.mk
+++ b/common.mk
@@ -112,8 +112,7 @@ do-install-doc: $(PROGRAM)
 
 pre-install: pre-install-local pre-install-ext
 pre-install-local:: PHONY
-	$(RM) $(prefix)/lib/$(LIBRUBY)
-	$(RM) -r $(prefix)/lib/ruby/$(MAJOR).$(MINOR)/$(arch)
+	$(PREINSTALL)
 pre-install-ext:: PHONY
 pre-install-doc:: PHONY
 
diff --git a/configure.in b/configure.in
index 7fc0a036cd..8ee5e6d871 100644
--- a/configure.in
+++ b/configure.in
@@ -1449,6 +1449,9 @@ case "$target_os" in
 	esac
 	MINIOBJS=dmydln.o
 	;;
+    aix*)
+	PREINSTALL='@$(RM) -r $(prefix)/lib/$(LIBRUBY_A) $(prefix)/lib/$(LIBRUBY_SO) $(prefix)/lib/ruby/$(MAJOR).$(MINOR)/$(arch)'
+	;;
     *)
 	;;
 esac
@@ -1481,6 +1484,7 @@ AC_SUBST(COMMON_MACROS)
 AC_SUBST(COMMON_HEADERS)
 AC_SUBST(EXPORT_PREFIX)
 AC_SUBST(MINIOBJS)
+AC_SUBST(PREINSTALL)
 
 MAKEFILES="Makefile `echo $FIRSTMAKEFILE | sed 's/:.*//'`"
 MAKEFILES="`echo $MAKEFILES`"