diff --git a/lzo-2.03-alias.patch b/lzo-2.03-alias.patch
new file mode 100644
index 0000000..96559d7
--- /dev/null
+++ b/lzo-2.03-alias.patch
@@ -0,0 +1,78 @@
+Index: src/lzo_init.c
+===================================================================
+--- src/lzo_init.c.orig	2008-04-30 14:51:49.000000000 +0200
++++ src/lzo_init.c	2010-02-11 12:25:02.000000000 +0100
+@@ -90,8 +90,13 @@ LZO_PUBLIC(int)
+ _lzo_config_check(void)
+ {
+     lzo_bool r = 1;
+-    union { unsigned char c[2*sizeof(lzo_xint)]; lzo_xint l[2]; } u;
+-    lzo_uintptr_t p;
++    volatile union {
++	    unsigned char c[2*sizeof(lzo_xint)];
++	    lzo_xint l[2];
++	    unsigned short s[2*sizeof(lzo_xint)/sizeof(unsigned short)];
++	    lzo_uint32 i[2*sizeof(lzo_xint)/sizeof(lzo_uint32)];
++    } u;
++    const volatile unsigned char *p;
+ 
+ #if !defined(LZO_CFG_NO_CONFIG_CHECK)
+ #if defined(LZO_ABI_BIG_ENDIAN)
+@@ -103,14 +108,14 @@ _lzo_config_check(void)
+     r &= (u.l[0] == 128);
+ #endif
+ #if defined(LZO_UNALIGNED_OK_2)
+-    p = (lzo_uintptr_t) (const lzo_voidp) &u.c[0];
++    p = &u.c[0];
+     u.l[0] = u.l[1] = 0;
+-    r &= ((* (const lzo_ushortp) (p+1)) == 0);
++    r &= ((* (const volatile unsigned short *) (p+1)) == 0);
+ #endif
+ #if defined(LZO_UNALIGNED_OK_4)
+-    p = (lzo_uintptr_t) (const lzo_voidp) &u.c[0];
++    p = &u.c[0];
+     u.l[0] = u.l[1] = 0;
+-    r &= ((* (const lzo_uint32p) (p+1)) == 0);
++    r &= ((* (const volatile lzo_uint32 *) (p+1)) == 0);
+ #endif
+ #endif
+ 
+Index: minilzo/minilzo.c
+===================================================================
+--- minilzo/minilzo.c.orig	2008-04-30 14:51:49.000000000 +0200
++++ minilzo/minilzo.c	2010-02-11 12:25:08.000000000 +0100
+@@ -2444,8 +2444,13 @@ LZO_PUBLIC(int)
+ _lzo_config_check(void)
+ {
+     lzo_bool r = 1;
+-    union { unsigned char c[2*sizeof(lzo_xint)]; lzo_xint l[2]; } u;
+-    lzo_uintptr_t p;
++    volatile union {
++	unsigned char c[2*sizeof(lzo_xint)];
++	lzo_xint l[2];
++	unsigned short s[2*sizeof(lzo_xint)/sizeof(unsigned short)];
++	lzo_uint32 i[2*sizeof(lzo_xint)/sizeof(lzo_uint32)];
++    } u;
++    const volatile unsigned char *p;
+ 
+ #if !defined(LZO_CFG_NO_CONFIG_CHECK)
+ #if defined(LZO_ABI_BIG_ENDIAN)
+@@ -2457,14 +2462,14 @@ _lzo_config_check(void)
+     r &= (u.l[0] == 128);
+ #endif
+ #if defined(LZO_UNALIGNED_OK_2)
+-    p = (lzo_uintptr_t) (const lzo_voidp) &u.c[0];
++    p = &u.c[0];
+     u.l[0] = u.l[1] = 0;
+-    r &= ((* (const lzo_ushortp) (p+1)) == 0);
++    r &= ((* (const volatile unsigned short *) (p+1)) == 0);
+ #endif
+ #if defined(LZO_UNALIGNED_OK_4)
+-    p = (lzo_uintptr_t) (const lzo_voidp) &u.c[0];
++    p = &u.c[0];
+     u.l[0] = u.l[1] = 0;
+-    r &= ((* (const lzo_uint32p) (p+1)) == 0);
++    r &= ((* (const volatile lzo_uint32 *) (p+1)) == 0);
+ #endif
+ #endif
+ 
diff --git a/lzo.changes b/lzo.changes
index 1bffb0c..8f859f0 100644
--- a/lzo.changes
+++ b/lzo.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Feb 11 12:30:25 CET 2010 - rguenther@suse.de
+
+- fix aliasing problems
+
 -------------------------------------------------------------------
 Sat Dec 19 16:48:18 CET 2009 - jengelh@medozas.de
 
diff --git a/lzo.spec b/lzo.spec
index 940236f..9b7a4fb 100644
--- a/lzo.spec
+++ b/lzo.spec
@@ -21,10 +21,11 @@
 Name:           lzo
 Url:            http://www.oberhumer.com/opensource/lzo/
 Version:        2.03
-Release:        5
+Release:        6
 Group:          Development/Libraries/C and C++
 Source:         lzo-%{version}.tar.bz2
 Source2:        baselibs.conf
+Patch1:         lzo-2.03-alias.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildRequires:  gcc-c++
 # bug437293
@@ -102,6 +103,7 @@ Authors:
 
 %prep
 %setup -q
+%patch1
 
 %build
 %configure --enable-shared --disable-static --libdir=/%{_lib}