Hi,

I managed to build lib2geom on OS X. Since it was not an easy task I thought it might be useful to share the information with the community.

I planned to write a small tutorial and make it available soon. But first I'd like to request some advice regarding the following issues I faced during the build.

1. Avoid glib dependency

I wanted to link lib2geom against my application without having to link against glib too so I replaced the following line in src/2geom/svg-path-parser.cpp:

_push(g_ascii_strtod(buf.c_str(), NULL));

with

_push(strtod(buf.c_str(), NULL));

and removed the glib.h include.

2. Removing librt

Since librt does not exist in OS X (and is not required too) I removed the following line in src/2geom/toys/CMakeLists.txt

TARGET_LINK_LIBRARIES(lpetoy "-lrt")

TARGET_LINK_LIBRARIES(toy-2 "-lrt")

3. Call to pow is ambiguous

Call to the pow function is ambiguous so I forced the call with casting by replacing

pow( ..., ... )

with

pow( (double) ..., (double) …)

in the following files:

boolops-topo.cpp

intersect-data.cpp

levelsets-test.cpp 

pencil-2.cpp

pencil.cpp

sb-to-bez.cpp

sketch-fitter.cpp

sweeper-toy.cpp

4. clock_gettime does not exist on OS X

In src/2geom/toys/toy-framework-2.h I replaced the following code snippet:

#ifdef WIN32

    clock_gettime(clock, &ts);

    ns = ts.tv_sec * NS_PER_SECOND + ts.tv_nsec / NS_PER_NS;

#else

    ns = 0;

#endif

with

#ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time

    clock_serv_t cclock;

    mach_timespec_t mts;

    host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);

    clock_get_time(cclock, &mts);

    mach_port_deallocate(mach_task_self(), cclock);

    ts.tv_sec = mts.tv_sec;

    ts.tv_nsec = mts.tv_nsec;

    ns = ts.tv_sec * NS_PER_SECOND + ts.tv_nsec / NS_PER_NS;

#elif WIN32

    clock_gettime(clock, &ts);

    ns = ts.tv_sec * NS_PER_SECOND + ts.tv_nsec / NS_PER_NS;

#else

    ns = 0;

#endif

and add the required includes at the beginning of the file.

#ifdef __MACH__

# include <mach/clock.h>

# include <mach/mach.h>

#endif

See http://stackoverflow.com/questions/5167269/clock-gettime-alternative-in-mac-os-x

5. Cannot compile pw-toy.cpp

I was not able to compile src/2geom/toys/pw-toy.cpp so I simply disable it in src/2geom/toys/CmakeLists.txt.

src/2geom/toys/pw-toy.cpp:48:30: error: variable length array of non-POD element type 'Piecewise<Geom::SBasis>'

Piecewise<SBasis> pws[curves];

6. Missing return value

Added “return 0;” at the end of the function “cmpy” in uncross.cpp.

src/2geom/toys/uncross.cpp:175:5: error: control may reach end of non-void function [-Werror,-Wreturn-type]

That's all! :)

Thanks in advance

Regards.