Make sure that the libraries are linked with libiconv if necessary, to avoid
the build failing like so (on Linux systems):
g++ -fexceptions -funsigned-char -fPIC -Wno-multichar -Wno-implicit -Wno-ctor-dtor-privacy -O2 -I/tmp/pkgsrc1/devel/exempi/work/.buildlink/include -Wl,-R/usr/pkgroot1/lib -o xmpfilescoverage XMPFilesCoverage.o -L/tmp/pkgsrc1/devel/exempi/work/.buildlink/lib ../../source/XMPCore/.libs/libXMPCore.a ../../source/XMPFiles/.libs/libXMPFiles.a ../../source/common/.libs/libxmpcommon.a /tmp/pkgsrc1/devel/exempi/work/.buildlink/lib/libexpat.so ../../third-party/MD5/.libs/libmd5.a -Wl,--rpath -Wl,/tmp/pkgsrc1/devel/exempi/work/.buildlink/lib -Wl,--rpath -Wl,/tmp/pkgsrc1/devel/exempi/work/.buildlink/lib
../../source/XMPFiles/.libs/libXMPFiles.a(Reconcile_Impl.o): In function `ReconcileUtils::Latin1ToUTF8(void const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> >*)':
Reconcile_Impl.cpp:(.text+0x1a1): undefined reference to `libiconv_open'
Reconcile_Impl.cpp:(.text+0x1f0): undefined reference to `libiconv'
Reconcile_Impl.cpp:(.text+0x1fb): undefined reference to `libiconv_close'
../../source/XMPFiles/.libs/libXMPFiles.a(Reconcile_Impl.o): In function `ReconcileUtils::UTF8ToLatin1(void const*, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> >*)':
Reconcile_Impl.cpp:(.text+0x341): undefined reference to `libiconv_open'
Reconcile_Impl.cpp:(.text+0x390): undefined reference to `libiconv'
Reconcile_Impl.cpp:(.text+0x39b): undefined reference to `libiconv_close'
collect2: ld returned 1 exit status
*** Error code 1
93843d295d