/usr/include/fontforge/lookups.h is in libfontforge-dev 0.0.20110222-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | extern void SortInsertLookup(SplineFont *sf, OTLookup *newotl);
extern char *SuffixFromTags(FeatureScriptLangList *fl);
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