When I run autoreconf -fiv I see a different set of failures:

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Making all in src
make[2]: Entering directory `/dev/shm/kaffeine-mozilla/src'
/bin/sh ../libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I. -I..    -O2 -march=i486 -mtune=i686   -O2 -march=i486 -mtune=i686 -MT plugin.lo -MD -MP -MF .deps/plugin.Tpo -c -o plugin.lo plugin.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -I.. -O2 -march=i486 -mtune=i686 -O2 -march=i486 -mtune=i686 -MT plugin.lo -MD -MP -MF .deps/plugin.Tpo -c plugin.c  -fPIC -DPIC -o .libs/plugin.o
In file included from jritypes.h:45,
                 from jri.h:45,
                 from npapi.h:10,
                 from plugin.c:72:
jri_md.h:46:64: error: nspr/prtypes.h: No such file or directory
In file included from plugin.c:72:
npapi.h:94: error: expected specifier-qualifier-list before 'uint32'
npapi.h:102: error: expected specifier-qualifier-list before 'int32'
npapi.h:110: error: expected specifier-qualifier-list before 'int32'
npapi.h:141: error: expected specifier-qualifier-list before 'int32'
npapi.h:146: error: expected specifier-qualifier-list before 'int32'
npapi.h:177: error: expected specifier-qualifier-list before 'uint32'
npapi.h:339: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'NPP_WriteReady'
npapi.h:340: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'NPP_Write'
npapi.h:366: error: expected declaration specifiers or '...' before 'uint32'
npapi.h:370: error: expected declaration specifiers or '...' before 'uint32'
npapi.h:375: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'NPN_Write'
npapi.h:381: error: expected ')' before 'size'
npapi.h:383: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'NPN_MemFlush'
plugin.c: In function 'NPP_New':
plugin.c:333: warning: assignment makes pointer from integer without a cast
plugin.c: In function 'NPP_SetWindow':
plugin.c:402: error: 'NPWindow' has no member named 'ws_info'
plugin.c:404: error: 'NPWindow' has no member named 'width'
plugin.c:405: error: 'NPWindow' has no member named 'height'
plugin.c:409: error: 'NPWindow' has no member named 'x'
plugin.c:409: error: 'NPWindow' has no member named 'y'
plugin.c:409: error: 'NPWindow' has no member named 'width'
plugin.c:409: error: 'NPWindow' has no member named 'height'
plugin.c: At top level:
plugin.c:517: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'STREAMBUFSIZE'
plugin.c:521: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'NPP_WriteReady'
plugin.c:532: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'NPP_Write'
make[2]: *** [plugin.lo] Error 1
make[2]: Leaving directory `/dev/shm/kaffeine-mozilla/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/dev/shm/kaffeine-mozilla'
make: *** [all] Error 2
There was an error trying to build kaffeine-mozilla.
EXIT_CODE: 1

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Darrell