spatial index - Undefined reference to libspatialindex functions in C++ -

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i'm getting started libspatialindex. ran through instructions install @ http://libspatialindex.github.io/install.html , installed ok on ubuntu following commands (except couldn't find autogen.sh mentions).

./configure make sudo make install

then made simple program test follows (based on https://github.com/libspatialindex/libspatialindex/wiki/simple-tutorial )

#include <spatialindex/capi/sidx_api.h> using namespace spatialindex; int main(int argc, char* argv[]) {     char* pszversion = sidx_version(); }

and compile follows:

g++ -lspatialindex spatial.cpp -o spatial

and gives me error:

/tmp/ccack3p4.o: in function `main': spatial.cpp:(.text+0xa): undefined reference `sidx_version' collect2: ld returned 1 exit status

i've tried many different things such using cmake instead , installing different folder no luck. ideas?

edit:

added namespace spatialindex above , tried following, still not luck:

g++ -c -o spatial.o spatial.cpp g++ -o spatial spatial.o -lspatialindex -lm

the problem linking phase. library correctly found because compiler dont throws alert(s) of kind of situation (i made test now). a

> nm libspatialindex |grep sidx_version

for checking symbol existence in library using. may libspatialindex_c instead?


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