Check dependencies
warning: no rule to process file '$(PROJECT_DIR)/tree/../../tree.h' of type sourcecode.c.h for architecture x86_64
Ld /Users/apple/Library/Developer/Xcode/DerivedData/tree-elojulfnklgwjoddznuscneqjhsz/Build/Products/Debug/tree normal x86_64
cd /Users/apple/Desktop/tree/tree
setenv MACOSX_DEPLOYMENT_TARGET 10.7
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk -L/Users/apple/Library/Developer/Xcode/DerivedData/tree-elojulfnklgwjoddznuscneqjhsz/Build/Products/Debug -F/Users/apple/Library/Developer/Xcode/DerivedData/tree-elojulfnklgwjoddznuscneqjhsz/Build/Products/Debug -filelist /Users/apple/Library/Developer/Xcode/DerivedData/tree-elojulfnklgwjoddznuscneqjhsz/Build/Intermediates/tree.build/Debug/tree.build/Objects-normal/x86_64/tree.LinkFileList -mmacosx-version-min=10.7 -liconv.2.4.0 -lsqlite3.0 -o /Users/apple/Library/Developer/Xcode/DerivedData/tree-elojulfnklgwjoddznuscneqjhsz/Build/Products/Debug/tree
Undefined symbols for architecture x86_64:
"Binary_tree<int>::Binary_tree()", referenced from:
_main in main.o
"Binary_tree<int>::~Binary_tree()", referenced from:
_main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
"Binary_tree<int>::Binary_tree()", referenced from: