/usr/include/NTL/config_log.h is in libntl-dev 10.5.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | // generated by ./configure SHARED=on NATIVE=off CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2 CXXFLAGS=-g -O2 -fdebug-prefix-map=/build/ntl-rOZgLU/ntl-10.5.0=. -fstack-protector-strong -Wformat -Werror=format-security -Wall LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro DEF_PREFIX=/usr NTL_GMP_LIP=on SHARED=on NTL_GF2X_LIB=on TUNE=generic
// CXXAUTOFLAGS=""
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