enable libsecp256k1_jni shared lib #64

$ ./configure --enable-jni
checking build system type... i686-pc-mingw32
checking host system type... i686-pc-mingw32
checking for a BSD-compatible install... /bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking how to print strings... printf
checking for style of include used by make... GNU
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.exe
checking for suffix of executables... .exe
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking dependency style of gcc... gcc3
checking for a sed that does not truncate output... /bin/sed
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for fgrep... /bin/grep -F
checking for ld used by gcc... c:/mingw/mingw32/bin/ld.exe
checking if the linker (c:/mingw/mingw32/bin/ld.exe) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /bin/nm -B
checking the name lister (/bin/nm -B) interface... BSD nm
checking whether ln -s works... no, using cp -p
checking the maximum length of command line arguments... 8192
checking whether the shell understands some XSI constructs... yes
checking whether the shell understands "+="... yes
checking how to convert i686-pc-mingw32 file names to i686-pc-mingw32 format...
func_convert_file_msys_to_w32
checking how to convert i686-pc-mingw32 file names to toolchain format... func_c
onvert_file_msys_to_w32
checking for c:/mingw/mingw32/bin/ld.exe option to reload object files... -r
checking for objdump... objdump
checking how to recognize dependent libraries... file_magic ^x86 archive import|
^x86 DLL
checking for dlltool... dlltool
checking how to associate runtime and link libraries... func_cygming_dll_for_imp
lib
checking for ar... ar
checking for archiver @FILE support... @
checking for strip... strip
checking for ranlib... ranlib
checking command to parse /bin/nm -B output from gcc object... ok
checking for sysroot... no
checking for mt... no
checking if : is a manifest tool... no
checking how to run the C preprocessor... gcc -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for dlfcn.h... no
checking for objdir... .libs
checking if gcc supports -fno-rtti -fno-exceptions... no
checking for gcc option to produce PIC... -DDLL_EXPORT -DPIC
checking if gcc PIC flag -DDLL_EXPORT -DPIC works... yes
checking if gcc static flag -static works... yes
checking if gcc supports -c -o file.o... yes
checking if gcc supports -c -o file.o... (cached) yes
checking whether the gcc linker (c:/mingw/mingw32/bin/ld.exe) supports shared li
braries... yes
checking whether -lc should be explicitly linked in... yes
checking dynamic linker characteristics... Win32 ld.exe
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking for gcc... (cached) gcc
checking whether we are using the GNU C compiler... (cached) yes
checking whether gcc accepts -g... (cached) yes
checking for gcc option to accept ISO C89... (cached) none needed
checking dependency style of gcc... (cached) gcc3
checking how to run the C preprocessor... gcc -E
checking for a sed that does not truncate output... (cached) /bin/sed
./configure: line 12220: PKG_PROG_PKG_CONFIG: command not found
checking for ar... /mingw/bin/ar
checking for ranlib... /mingw/bin/ranlib
checking for strip... /mingw/bin/strip
checking for gcc option to accept ISO C99... -std=gnu99
checking for __int128... no
checking whether __builtin_expect is declared... yes
checking gmp.h usability... yes
checking gmp.h presence... yes
checking for gmp.h... yes
checking for __gmpz_init in -lgmp... yes
checking openssl/crypto.h usability... no
checking openssl/crypto.h presence... no
checking for openssl/crypto.h... no
checking for JAVA_HOME... checking for java... /c/Program Files/Java/jdk1.6.0_23
/bin/java
/c/Program Files/Java/jdk1.6.0_23
checking jni.h usability... no
checking jni.h presence... no
checking for jni.h... no
configure: error: jni.h not found at /c/Program Files/Java/jdk1.6.0_23/include/.
 Check your JAVA_HOME env var or use --disable-jni