./libtool: line 860: X--tag=CC: command not found

[saper]

$ make
make  all-am
make[1]: Entering directory `/usr/home/saper/sw/mysql-udf-regexp/regexp'
if /bin/sh ./libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I.    -I/usr/home/saper/sw/mysql-5.6.31/include -I/usr/home/saper/sw/mysql-5.6.31  -I/usr/home/saper/sw/mysql-5.6.31/sql  -g -O2 -MT regexp_la-regexp.lo -MD -MP -MF ".deps/regexp_la-regexp.Tpo" -c -o regexp_la-regexp.lo `test -f 'regexp.c' || echo './'`regexp.c; \
then mv -f ".deps/regexp_la-regexp.Tpo" ".deps/regexp_la-regexp.Plo"; else rm -f ".deps/regexp_la-regexp.Tpo"; exit 1; fi
./libtool: line 860: X--tag=CC: command not found
./libtool: line 893: libtool: ignoring unknown tag : command not found
./libtool: line 860: X--mode=compile: command not found
./libtool: line 1010: *** Warning: inferring the mode of operation is deprecated.: command not found
./libtool: line 1011: *** Future versions of Libtool will require --mode=MODE be specified.: command not found
./libtool: line 1154: Xgcc: command not found
./libtool: line 1154: X-DHAVE_CONFIG_H: command not found
./libtool: line 1154: X-I.: command not found
./libtool: line 1154: X-I.: command not found
./libtool: line 1154: X-I.: command not found
./libtool: line 1154: X-I/usr/home/saper/sw/mysql-5.6.31/include: No such file or directory
./libtool: line 1154: X-I/usr/home/saper/sw/mysql-5.6.31: No such file or directory
./libtool: line 1154: X-I/usr/home/saper/sw/mysql-5.6.31/sql: No such file or directory
./libtool: line 1154: X-g: command not found
./libtool: line 1154: X-O2: command not found
./libtool: line 1154: X-MT: command not found
./libtool: line 1154: Xregexp_la-regexp.lo: command not found
./libtool: line 1154: X-MD: command not found
./libtool: line 1154: X-MP: command not found
./libtool: line 1154: X-MF: command not found
./libtool: line 1154: X.deps/regexp_la-regexp.Tpo: No such file or directory
./libtool: line 1154: X-c: command not found
./libtool: line 1205: Xregexp_la-regexp.lo: command not found
./libtool: line 1210: libtool: compile: cannot determine name of library object from `': command not found
make[1]: *** [regexp_la-regexp.lo] Error 1
make[1]: Leaving directory `/usr/home/saper/sw/mysql-udf-regexp/regexp'
make: *** [all] Error 2

[saper]

a workaround is to compile by hand as shown in #3 (comment)