/usr/include/zsh/math.epro is in zsh-dev 5.0.2-3ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | /* Generated automatically */
#ifndef have_Src_math_globals
#define have_Src_math_globals
extern int noeval;
extern mod_import_variable mnumber zero_mnumber;
extern mnumber lastmathval;
extern int lastbase;
extern int outputradix;
extern void op _((int what));
extern mod_import_function mnumber matheval _((char*s));
extern mod_import_function zlong mathevali _((char*s));
extern zlong mathevalarg _((char*s,char**ss));
#endif /* !have_Src_math_globals */
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