pixman doesn't autodetect SIMD support at build time on arm.

Like the summary says, pixman is compiling without SIMD support on arm when the same package compiled under karmic does enable SIMD support.

The configure.ac check that is failing -

dnl Check for ARM SIMD instructions
ARM_SIMD_CFLAGS="-mcpu=arm1136j-s"

have_arm_simd=no
AC_MSG_CHECKING(whether to use ARM SIMD assembler)
xserver_save_CFLAGS=$CFLAGS
CFLAGS="$ARM_SIMD_CFLAGS $CFLAGS"
AC_COMPILE_IFELSE([
int main () {
    asm("uqadd8 r1, r1, r2");
    return 0;
}], have_arm_simd=yes)
CFLAGS=$xserver_save_CFLAGS

AC_ARG_ENABLE(arm-simd,
   [AC_HELP_STRING([--disable-arm-simd],
                   [disable ARM SIMD fast paths])],
   [enable_arm_simd=$enableval], [enable_arm_simd=auto])

if test $enable_arm_simd = no ; then
   have_arm_simd=disabled
fi

if test $have_arm_simd = yes ; then
   AC_DEFINE(USE_ARM_SIMD, 1, [use ARM SIMD compiler intrinsics])
else
   ARM_SIMD_CFLAGS=
fi

AC_MSG_RESULT($have_arm_simd)
if test $enable_arm_simd = yes && test $have_arm_simd = no ; then
   AC_MSG_ERROR([ARM SIMD intrinsics not detected])
fi

AC_SUBST(ARM_SIMD_CFLAGS)

AM_CONDITIONAL(USE_ARM_SIMD, test $have_arm_simd = yes)

from #ubuntu-arm irc with a fix-
<lool> Sarvatt: Quick workaround for you: add CFLAGS+=-marm in debian/rules