/usr/include/postgresql/9.3/server/snowball/ is in postgresql-server-dev-9.3 9.3.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/postgresql/9.3/server/snowball/header.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/
/usr/include/postgresql/9.3/server/snowball/libstemmer/api.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/header.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_danish.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_dutch.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_english.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_finnish.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_french.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_german.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_hungarian.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_italian.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_norwegian.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_porter.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_portuguese.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_spanish.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_1_swedish.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_ISO_8859_2_romanian.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_KOI8_R_russian.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_danish.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_dutch.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_english.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_finnish.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_french.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_german.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_hungarian.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_italian.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_norwegian.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_porter.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_portuguese.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_romanian.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_russian.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_spanish.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_swedish.h
/usr/include/postgresql/9.3/server/snowball/libstemmer/stem_UTF_8_turkish.h