configure/configure_ftlRegex.c: unexpected/differ printf format

[band-a-prend]

On compiling ftl library with pcre enabled the warning about differ format appears:

make -j4 BUILD=release USE_PCRE=true COMPILER=x86_64-pc-linux-gnu-gfortran 'FLAGS=-march=westmere -mno-aes -mno-avx -O2 -pipe' CXXCOMPILER=x86_64-pc-linux-gnu-g++ 'CXXFLAGS=-march=westmere -mno-aes -mno-avx -O2 -pipe' 
mkdir build.gnu.release
x86_64-pc-linux-gnu-g++ -DUSE_PCRE configure/configure_ftlRegex.c -o configure/configure_ftlRegex
x86_64-pc-linux-gnu-gfortran -march=westmere -mno-aes -mno-avx -O2 -pipe -Isrc -Itests -DUSE_PCRE -fPIC -c src/ftlKinds.F90 -o build.gnu.release/ftlKinds.o
x86_64-pc-linux-gnu-gfortran -march=westmere -mno-aes -mno-avx -O2 -pipe -Isrc -Itests -DUSE_PCRE -fPIC -c src/ftlHash.F90 -o build.gnu.release/ftlHash.o
configure/configure_ftlRegex.c: In function ‘int main()’:
configure/configure_ftlRegex.c:12:61: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long unsigned int’ [-Wformat=]
   12 |    printf("integer(C_int), parameter :: sizeof_C_regex_t = %d_C_int\n", sizeof(regex_t));
      |                                                            ~^           ~~~~~~~~~~~~~~~
      |                                                             |           |
      |                                                             int         long unsigned int
      |                                                            %ld
x86_64-pc-linux-gnu-gfortran -march=westmere -mno-aes -mno-avx -O2 -pipe -Isrc -Itests -DUSE_PCRE -fPIC -c src/ftlString.F90 -o build.gnu.release/ftlString.o
./configure/configure_ftlRegex | tee src/configure_ftlRegex.inc
integer(C_int), parameter :: sizeof_C_regex_t = 24_C_int
integer(C_int), parameter :: REG_EXTENDED = 0_C_int
integer(C_int), parameter :: REG_ICASE    = 1_C_int
integer(C_int), parameter :: REG_NEWLINE  = 2_C_int
integer(C_int), parameter :: REG_NOSUB    = 32_C_int
integer(C_int), parameter :: REG_NOTBOL = 4_C_int
integer(C_int), parameter :: REG_NOTEOL = 8_C_int
integer(C_int), parameter :: REG_NOMATCH = 17_C_int

GCC-10.2.0 and dev-libs/libpcre-8.44 are used in system with passing system FLAGS.