postgres-toolkit/src/verifychecksum$ LANG=C make
gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -g -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -fno-omit-frame-pointer -I. -I./ -I/usr/include/postgresql/11/server -I/usr/include/postgresql/internal  -Wdate-time -D_FORTIFY_SOURCE=2 -D_GNU_SOURCE -I/usr/include/libxml2  -I/usr/include/mit-krb5  -c -o verifychecksum.o verifychecksum.c
verifychecksum.c: In function 'verify_page':
verifychecksum.c:52:14: error: 'FALSE' undeclared (first use in this function)
       return FALSE;
              ^~~~~
verifychecksum.c:52:14: note: each undeclared identifier is reported only once for each function it appears in
verifychecksum.c:55:10: error: 'TRUE' undeclared (first use in this function)
   return TRUE;
          ^~~~
verifychecksum.c: In function 'verify_segmentfile':
verifychecksum.c:96:14: error: 'FALSE' undeclared (first use in this function)
       return FALSE;
              ^~~~~
verifychecksum.c:102:10: error: 'TRUE' undeclared (first use in this function)
   return TRUE;
          ^~~~
verifychecksum.c: In function 'verify_page':
verifychecksum.c:56:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
verifychecksum.c: In function 'verify_segmentfile':
verifychecksum.c:103:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
<builtin>: recipe for target 'verifychecksum.o' failed
make: *** [verifychecksum.o] Error 1