The documentstion and pixmap files in the current version (0.21-16) are installed in the roor directory instead of /usr/local/share/gnome
The install log is pasted below with the offending operations indicated by "<---" at th end of the lines
install -d /usr/local/bin
install -d /doc/gwc <---
install -d /pixmaps <---
install -d /usr/local//share/gnome/help/gnome_wave_cleaner/C
install -p -s gwc /usr/local/bin
install -p -m 0644 README INSTALL TODO COPYING Changelog /doc/gwc <---
for hf in gwc_qs.html gwc.html topic.dat ; do install -p -m 0644 doc/C/$hf /usr/local//share/gnome/help/gnome_wave_cleaner/C ; done
install -p -m 0644 gwc-logo.png /pixmaps <---
Everything should be installed in standard locations in the latest version. Please report if I am wrong.