# libPVRTexLib.a on MacOS **URL:** \ **Category:** PowerVR Insider\ **Created:** [August 12, 2010, 12:24pm UTC](https://forums.imgtec.com/t/libpvrtexlib-a-on-macos/794 "2010-08-12T12:24:30Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![windwalkr](https://avatars.discourse-cdn.com/v4/letter/w/f9ae1b/32.png) [@windwalkr](https://forums.imgtec.com/u/windwalkr)\ **Post date:** [August 12, 2010, 12:24pm UTC](https://forums.imgtec.com/t/libpvrtexlib-a-on-macos/794/1 "2010-08-12T12:24:30Z")
Hi guys, I would like to use libPVRTexLib to perform texture compression in an in-house tool, however when I try to link it, I’m seeing a number of errors such as: Code: "std::basic\_istream\ \>& std::basic\_istream\ \>::\_M\_extract\(unsigned int&)", referenced from:       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in libtrainzresource.a(pvrtcMW.o) "\_fopen$UNIX2003", referenced from:       pvrtexlib::CPVRTexture::writeToFile(char const\*, unsigned int) constin libtrainzresource.a(CPVRTexture.o) These appear to indicate a mismatch of the standard libraries between your prebuilt library and my project, but unfortunately your documentation does not indicate what compilers/settings might be necessary here. Could you provide any clues towards fixing this? thanks, chris ---
**Author:** ![GordonMaclachlan](https://avatars.discourse-cdn.com/v4/letter/g/c68b51/32.png) [@GordonMaclachlan](https://forums.imgtec.com/u/GordonMaclachlan)\ **Post date:** [August 12, 2010, 12:33pm UTC](https://forums.imgtec.com/t/libpvrtexlib-a-on-macos/794/2 "2010-08-12T12:33:04Z")
This is something that should probably be added to the documentation, along with an example. In my test makefile for this library I have the following lines: Code: LIBS =         -L/usr/lib         -lpthread         -lstdc++ -m32         $(DEVRELDIR)/UtilitiesSrc/PVRTexLib/PVRTexLibPublic/MacOS/libPVRTexLib.a         -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5 CFLAGS += -c -m32 -DHAVE\_GL\_H -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5 I use the -mmacosx-version-min flag to give compatiblity with Leopard - I suspect that might have something to do with the issue - are you running 10.6?  Also, the -m32 ensures 32bit mode (64bit support is not available yet). Please post again if this doesn't help you. ---
**Author:** ![windwalkr](https://avatars.discourse-cdn.com/v4/letter/w/f9ae1b/32.png) [@windwalkr](https://forums.imgtec.com/u/windwalkr)\ **Post date:** [August 12, 2010, 1:50pm UTC](https://forums.imgtec.com/t/libpvrtexlib-a-on-macos/794/3 "2010-08-12T13:50:56Z")
Thanks for the quick reply. I am running Xcode 3.2.3 on 10.6.4. My project settings include: Code: SDKROOT = macosx10.5 VALID\_ARCHS = i386 GCC\_VERSION = 4.2 MACOSX\_DEPLOYMENT\_TARGET = 10.5 The resultant buildline in xcode looks like this (filepaths abbreviated substantially to protect the guilty and to make it readable): Code: setenv MACOSX\_DEPLOYMENT\_TARGET 10.5 /Developer/usr/bin/g++-4.2 -arch i386 -isysroot /Developer/SDKs/MacOSX10.5.sdk -L/XXXX -F/XXXX -filelist /XXXX.LinkFileList -mmacosx-version-min=10.5 -lssl -lz -lcrypto /XXXX.a /XXXX.a -o /XXXX Any further thoughts? cheers, chris ---
**Author:** ![esenthel-2](https://avatars.discourse-cdn.com/v4/letter/e/c68b51/32.png) [@esenthel-2](https://forums.imgtec.com/u/esenthel-2)\ **Post date:** [September 1, 2010, 3:21pm UTC](https://forums.imgtec.com/t/libpvrtexlib-a-on-macos/794/4 "2010-09-01T15:21:41Z")
Hello, I have the same problem, I want to use the library in my engine - http://www.esenthel.com/ And was successfull with 32-bit under Windows, but on Mac I have the same linker errors as in first post. I use xcode 3.2.3 on mac os x 10.6 I use mac os 10.5 sdk for building the project, with 32-bit (i386) architecture. The linker errors are: Code: "std::basic\_istream\ \>& std::basic\_istream\ \>::\_M\_extract\(unsigned int&)", referenced from:       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)   "\_fopen$UNIX2003", referenced from:       pvrtexlib::CPVRTexture::writeToFile(char const\*, unsigned int) constin EsenthelEngine.a(CPVRTexture.o)       pvrtexlib::SaveKTX(pvrtexlib::CPVRTextureHeader const&, pvrtexlib::CPVRTextureData const&, CPVRTString const&)in EsenthelEngine.a(ktx\_io.o)       readFile(CPVRTString const&, SafeArray\&)in EsenthelEngine.a(Utilities.o)       pvrtexlib::ConsoleLog::setStraightToFile(bool)  in EsenthelEngine.a(ConsoleLog.o)       pvrtexlib::ConsoleLog::setOutputFile(CPVRTString)       in EsenthelEngine.a(ConsoleLog.o)       pvrtexlib::ConsoleLog::writeToFile()      in EsenthelEngine.a(ConsoleLog.o)       pvrtexlib::ConsoleLog::appendToFile()      in EsenthelEngine.a(ConsoleLog.o)       pvrtexlib::writeToIncludeFile(pvrtexlib::CPVRTextureHeader const&, pvrtexlib::CPVRTextureData const&, char const\*, char const\*)in EsenthelEngine.a(pvr\_io.o)       pvrtexlib::SavePVR(pvrtexlib::CPVRTextureHeader const&, pvrtexlib::CPVRTextureData const&, CPVRTString const&)in EsenthelEngine.a(pvr\_io.o)       pvrtexlib::SaveDDS(pvrtexlib::CPVRTextureHeader const&, pvrtexlib::CPVRTextureData const&, char const\*)in EsenthelEngine.a(dds\_io.o)       pvrtexlib::SaveNGT(pvrtexlib::CPVRTextureHeader const&, pvrtexlib::CPVRTextureData const&, CPVRTString const&)in EsenthelEngine.a(ngt\_io.o)       pvrtexlib::fileExist(char\*) in EsenthelEngine.a(etc\_conversion.o)       \_bitmap\_write\_window in EsenthelEngine.a(bitmap.o)       \_bitmap\_read in EsenthelEngine.a(bitmap.o)   "std::basic\_ostream\ \>& std::\_\_ostream\_insert\ \>(std::basic\_ostream\ \>&, char const\*, int)", referenced from:       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::writePPM(char const\*, pvrtexlib::Pixel\ const\*, unsigned int, unsigned int, bool)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::writePPM(char const\*, pvrtexlib::Pixel\ const\*, unsigned int, unsigned int, bool)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::writePPM(char const\*, pvrtexlib::Pixel\ const\*, unsigned int, unsigned int, bool)in EsenthelEngine.a(pvrtcMW.o)   "std::basic\_ostream\ \>& std::basic\_ostream\ \>::\_M\_insert\(unsigned long)", referenced from:       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::readPPM(char const\*, pvrtexlib::Pixel\\*\*, unsigned int&, unsigned int&)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::writePPM(char const\*, pvrtexlib::Pixel\ const\*, unsigned int, unsigned int, bool)in EsenthelEngine.a(pvrtcMW.o)       pvrtexlib::writePPM(char const\*, pvrtexlib::Pixel\ const\*, unsigned int, unsigned int, bool)in EsenthelEngine.a(pvrtcMW.o) OTHER\_LFFLAGS= -L/usr/lib -lpthread -lstdc++ -m32 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5 -framework Carbon -framework Cocoa -framework OpenGL -framework OpenAL -framework Cg -lz OTHER\_CFLAGS = -fshort-wchar -ffriend-injection -c -m32 -DHAVE\_GL\_H -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5 Also I have a big request for 64-bit support, for both Windows and Mac. And it would be nice to have the library on Windows as .lib only and not .dll Thanks Grzegorz Esenthel2010-09-01 17:39:42 ---
**Author:** ![GordonMaclachlan](https://avatars.discourse-cdn.com/v4/letter/g/c68b51/32.png) [@GordonMaclachlan](https://forums.imgtec.com/u/GordonMaclachlan)\ **Post date:** [September 22, 2010, 3:33pm UTC](https://forums.imgtec.com/t/libpvrtexlib-a-on-macos/794/5 "2010-09-22T15:33:09Z")
Thanks for reporting this issue. It’s being looked into (along with 64bit builds) and a fix should be available in an update in the future.