c++ - gluDisk() function opengl -


i trying create function in program draws disk. have .h file called drawshape have drawing functions there. trying add drawdisk it, seen below;howerver keep getting error saying have undefined reference glunewquadric , gludisk. have #included glu.h library, i'm not sure wrong code.

void drawdisk(double indiameter, double outdiameter, int vertslices, int horizslices) {     gluquadricobj *disk;     disk = glunewquadric();      gludisk(disk, indiameter, outdiameter, vertslices, horizslices); }

here makefile requested below in comments section.

vrui_makedir := /opt/local/vrui-2.6/share/make ifdef debug   vrui_makedir := $(vrui_makedir)/debug endif  installdir := $(shell pwd)  # set resource directory: resourcedir = images  ######################################################################## ########################################################################  # include definitions system environment , system-provided # packages include $(vrui_makedir)/systemdefinitions include $(vrui_makedir)/packages.system include $(vrui_makedir)/configuration.vrui include $(vrui_makedir)/packages.vrui  # set installation directory structure: bininstalldir = $(installdir)/$(exedir) resourceinstalldir = $(installdir)/$(resourcedir)  ######################################################################## ########################################################################  packages = myvrui  ######################################################################## ########################################################################  = $(exedir)/solarsystem       .phony: all: $(all)  ######################################################################## #'make clean' ########################################################################  .phony: extraclean extraclean:  .phony: extrasqueakyclean extrasqueakyclean:  # include basic makefile include $(vrui_makedir)/basicmakefile  ######################################################################## ######################################################################## test = drawshape.cpp\     solarsystem.cpp\     planet.cpp\     skybox.cpp  $(objdir)/solarsystem.o: cflags += -dpicdir='"$(resourceinstalldir)"'  $(exedir)/solarsystem: $(test:%.cpp=$(objdir)/%.o)       install: $(all)     @echo installing vrui example programs in $(installdir)...     @install -d $(bininstalldir)     @install $(all) $(bininstalldir)     @install -d $(resourceinstalldir)     @install $(resourcedir)/earthtopography.png

i figured out. wrote function lets me draw disk , add texture it.

void drawdisk(double radiusx, double eccentricity, int inradius, int sidesmooth) {    double radiusy = 0.01; double pi = math::constants<double>::pi; double texy1 = 1.0f/double(inradius); double lat1 = 1.0f*pi/double(inradius)-0.5f*pi; double r1 = cosf(lat1); double z1 = sinf(lat1); for(int = 2; < inradius; ++i) {     double r0 = r1;     double z0 = z1;     double texy0 = texy1;     texy1 = double(i)/double(inradius);     lat1 = double(i)*pi/double(inradius)-0.5f*pi;     r1 = cosf(lat1);     z1 = sinf(lat1);      glbegin(gl_quad_strip);     for(int j=0; j <= sidesmooth; ++j)     {         double texx = double(j)/double(sidesmooth);         double lng = double(j)*(2.0f*pi)/double(sidesmooth);         double x1 = cosf(lng) * r1;         double y1 = sinf(lng) * r1;         glnormal3f(x1,y1,z1);         gltexcoord2f(texx,texy1);         glvertex3f(x1*radiusx,y1*radiusx*eccentricity,z1*radiusx*radiusy);         double x0 = cosf(lng)*r0;         double y0 = sinf(lng)*r0;         glnormal3f(x0,y0,z0);         gltexcoord2f(texx,texy0);         glvertex3f(x0*radiusx,y0*radiusx*eccentricity,z0*radiusx*radiusy);     }     glend(); }  }

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