LTLIBRARIES: mv *.Tpo *.Plo, but the former doesn't exist and the latter already does

I'm doing a pretty straight-forward conversion of an existing library (libtcod) to Autotools (for OS X happiness). Unfortunately, when I switch my `Makefile.am`'s `lib_LIBRARIES` rule to `lib_LTLIBRARIES`, the build goes from successful to un. Excerpt from the output below: ``` Making all in . make[1]: Nothing to be done for `all-am'. Making all in src /bin/sh ../libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -g -O2 -MT bresenham_c.lo -MD -MP -MF .deps/bresenham_c.Tpo -c -o bresenham_c.lo bresenham_c.c mv -f .deps/bresenham_c.Tpo .deps/bresenham_c.Plo mv: rename .deps/bresenham_c.Tpo to .deps/bresenham_c.Plo: No such file or directory make[1]: *** [bresenham_c.lo] Error 1 make: *** [all-recursive] Error 1 ``` `src/Makefile.am` looks like this: ``` lib_LTLIBRARIES = libtcod.la libtcod_la_SOURCES = bresenham_c.c bresenham3_c.c bsp_c.c color_c.c ... ``` `src/.deps` contains: ``` $ ls src/.deps/ bresenham_c.Plo bresenham_c.Po ... ``` Am I making an obvious mistake here, or should this work?