Where is glUseProgram() (etc) declared?

I'm trying to build Denise on NetBSD. It seems the GL headers are differently organized than on Linux. When compiling obj/driver.o there are many GL-related functions that the compiler complains are not declared. I attached compiler output. Functions that are mentioned include glUseProgram, glDeleteSync, glGetUniformLocation, glClientWaitSync, glBindFramebuffer, ...

I was thinking I need to include some extra header here in ./driver/video/opengl/opengl.h:

ifdef __APPLE__
    #include <OpenGL/gl3.h>
#elif _WIN32
    #include <GL/gl.h>
    #include <GL/glext.h>
    #define glGetProcAddress(name) wglGetProcAddress(name)
#else
    //#include <GL/glew.h>
    //#include <GL/glcorearb.h>
    #include <GL/gl.h>
    #include <GL/glx.h>
    #define glGetProcAddress(name) (*glXGetProcAddress)((const GLubyte*)(name))
#endif

but my attempts so far are unsuccessful.

If I search for, for example, glGetUniformLocation, I have references in several headers, like so:

$ grep -r '\<glGetUniformLocation\>' /usr/pkg/include/
/usr/pkg/include/GL/glcorearb.h:GLAPI GLint APIENTRY glGetUniformLocation (GLuint program, const GLchar *name);
/usr/pkg/include/GL/glext.h:GLAPI GLint APIENTRY glGetUniformLocation (GLuint program, const GLchar *name);
/usr/pkg/include/GL/glew.h:#define glGetUniformLocation GLEW_GET_FUN(__glewGetUniformLocation)
/usr/pkg/include/GLES2/gl2.h:GL_APICALL GLint GL_APIENTRY glGetUniformLocation (GLuint program, const GLchar *name);
/usr/pkg/include/GLES3/gl3.h:GL_APICALL GLint GL_APIENTRY glGetUniformLocation (GLuint program, const GLchar *name);
/usr/pkg/include/GLES3/gl31.h:GL_APICALL GLint GL_APIENTRY glGetUniformLocation (GLuint program, const GLchar *name);
/usr/pkg/include/GLES3/gl32.h:GL_APICALL GLint GL_APIENTRY glGetUniformLocation (GLuint program, const GLchar *name);
/usr/pkg/include/SDL/SDL_opengl.h:GLAPI GLint APIENTRY glGetUniformLocation (GLuint, const GLchar *);
/usr/pkg/include/epoxy/gl_generated.h:#define glGetUniformLocation epoxy_glGetUniformLocation
/usr/pkg/include/cogl/cogl/gl-prototypes/cogl-glsl-functions.h:COGL_EXT_FUNCTION (GLint, glGetUniformLocation,
/usr/pkg/include/SDL2/SDL_opengl_glext.h:GLAPI GLint APIENTRY glGetUniformLocation (GLuint program, const GLchar *name);
/usr/pkg/include/SDL2/SDL_opengles2_gl2.h:GL_APICALL GLint        GL_APIENTRY glGetUniformLocation (GLuint program, const GLchar* name);

Do you have a suggestion which header files should be included?

(aside: bitbucket's email confirmation link refused to work, it says "Something has gone wrong "....)

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