Estoy tratando de compilar JPostal pero aparece el siguiente error después de emitir el comando ./gradlew assemble :

 checking for gcj... no checking for guavac... no checking for jikes... no checking for javac... javac checking if javac works... yes checking for C:\x\Java\jdk1.8.0_191/include/jni.h... yes checking for stdlib.h... (cached) yes checking for string.h... (cached) yes checking for size_t... yes checking for uint16_t... yes checking for GNU libc compatible malloc... yes checking for strdup... yes checking for pkg-config... /usr/bin/pkg-config checking pkg-config is at least version 0.9.0... yes checking for LIBPOSTAL... yes checking that generated files are newer than configure... done configure: creating ./config.status config.status: creating Makefile config.status: creating src/main/c/Makefile config.status: creating config.h config.status: executing depfiles commands config.status: executing libtool commands

 Making install in src/main/c make[1]: Entering directory '/c/x/ProgramFiles/JPostal/src/main/c' /bin/sh ../../../libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I../../.. -g -O2 -IC:\x\Java\jdk1.8.0_191/include -MT libjpostal_parser_la-jpostal_AddressParser.lo -MD -MP -MF .deps/libjpostal_parser_la-jpostal_AddressParser.Tpo -c -o libjpostal_parser_la-jpostal_AddressParser.lo `test -f 'jpostal_AddressParser.c' || echo './'`jpostal_AddressParser.c libtool: compile: gcc -DHAVE_CONFIG_H -I. -I../../.. -g -O2 -IC:xJavajdk1.8.0_191/include -MT libjpostal_parser_la-jpostal_AddressParser.lo -MD -MP -MF .deps/libjpostal_parser_la-jpostal_AddressParser.Tpo -c jpostal_AddressParser.c -DDLL_EXPORT -DPIC -o .libs/libjpostal_parser_la-jpostal_AddressParser.o jpostal_AddressParser.c:1:10: fatal error: jni.h: No such file or directory 1 | #include <jni.h> | ^~~~~~~ compilation terminated. make[1]: *** [Makefile:473: libjpostal_parser_la-jpostal_AddressParser.lo] Error 1 make[1]: Leaving directory '/c/x/ProgramFiles/JPostal/src/main/c' make: *** [Makefile:404: install-recursive] Error 1 :buildJniLib FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':buildJniLib'. > Process 'command 'sh'' finished with non-zero exit value 2 * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. BUILD FAILED Total time: 58.914 secs

Instalé LibPostal exactamente como se describe aquí, entonces, ¿por qué faltan los archivos jni.h , gcj , guavac y jikes libs?

Revisé GitHub y no vi ningún problema abierto que abordara esta pregunta.

ACTUALIZACIÓN 1 :

En la siguiente captura de pantalla, puede ver que el jni.h' file is clearly present in carpeta /include/`: