I already have a patch fixing this bug. I tested the package and it builds after the fix.
The patch adds a compiler option which fixes the bug.
--- libwebp-0.4.1/debian/rules 2014-01-08 18:14:20.000000000 +0000 +++ libwebp-0.4.1.mine/debian/rules 2014-08-05 21:21:31.832507772 +0000 @@ -9,6 +9,11 @@ # Uncomment this to turn on verbose mode. export DH_VERBOSE=1 +ifneq (,$(findstring mips,$(DEB_HOST_ARCH))) + CFLAGS+= -mips32r2 + export CFLAGS +endif + # dh seems to assume that configure is already there configure: ./autogen.sh
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