g++ can't find headers but I did include them
c++, g++, header-files, leveldb, linker
Solution
You need to tell the linker to link to the `leveldb` library such as
g++ -I include/ testLevelDB.cpp -lleveldb
But this won't work if the library is not in `/usr/lib` or `/usr/local/lib` for that case assuming the libleveldb.so exists in some path called `$LEVELDB_PATH` you need to do
g++ -I include -L $LEVELDB_PATH testLevelDB.cpp -lleveldb
`-L` is much like `-I` but it tells the linker where to looks for libraries.
Also since you seem to be new to gcc world, please have a look at this gcc intro document.
Problem
I am starting on c++ and already going wrong ... I am trying to compile a small test of levelDB : ``` #include <assert.h> #include "leveldb/db.h" using namespace std; int main() { leveldb::DB* db; leveldb::Options options; options.create_if_missing = true; leveldb::Status status = leveldb::DB::Open(options, "/tmp/testdb", &db); assert(status.ok()); return 1; } ``` Here is the g++ command : ``` g++ -I include/ testLevelDB.cpp ``` Output: ``` /tmp/ccuBnfE7.o: In function `main': testLevelDB.cpp:(.text+0x14): undefined reference to `leveldb::Options::Options()' testLevelDB.cpp:(.text+0x57): undefined reference to `leveldb::DB::Open(leveldb::Options const&, std::string const&, leveldb::DB**)' ``` The include folder is the one with the levelDB headers.