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science/libkml: Fix linking with CMake >= 3.27
Due to changes [1] in the FindEXPAT module, this was failing to link with newer versions of CMake. FAILED: bin/example_balloonwalker : && /usr/bin/c++ -O2 -pipe -fstack-protector-strong -fno-strict-aliasing -std=c++11 -O2 -pipe -fstack-protector-strong -fno-strict-aliasing -std=c++11 -DNDEBUG -lz -fstack-protector-strong examples/engine/CMakeFiles/example_balloonwalker.dir/balloonwalker.cc.o -o bin/example_balloonwalker -Wl,-rpath,/wrkdirs/usr/ports/science/libkml/work/.build/lib:/usr/local/lib lib/libkmlengine.so.1.3.1 lib/libkmldom.so.1.3.1 lib/libkmlbase.so.1.3.1 /usr/local/lib/libminizip.so /usr/local/lib/liburiparser.so && : ld: error: lib/libkmldom.so.1.3.1: undefined reference to XML_StopParser [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_ParserCreateNS [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_ParserCreate [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_SetUserData [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_SetElementHandler [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_SetCharacterDataHandler [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_SetEntityDeclHandler [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_SetNamespaceDeclHandler [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_StopParser [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_ParserFree [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_Parse [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_GetBuffer [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_ParseBuffer [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_GetParsingStatus [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_GetErrorCode [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_ErrorString [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_GetCurrentLineNumber [--no-allow-shlib-undefined] ld: error: lib/libkmlbase.so.1.3.1: undefined reference to XML_GetCurrentColumnNumber [--no-allow-shlib-undefined] c++: error: linker command failed with exit code 1 (use -v to see invocation) [1] Kitware/CMake@13079f3 PR: 274225
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