Andreas Rottmann wrote:

I think you missed to specify --enable-libffi to ./configure.

Aha... thanks for the tip!

This is how I ran './configure':

./configure --enable-libffi CFLAGS=-I/usr/local/lib/libffi-3.0.8/include

I noticed this in the output of configure:

configure: WARNING: ffi.h: accepted by the compiler, rejected by the preprocessor!
configure: WARNING: ffi.h: proceeding with the compiler's result

So, 'lab/gears.scm' still doesn't work properly. When I load it, this is the output:

----------------------------------------------------------------------
GL_RENDERER   = "Mesa DRI Radeon 20061018 AGP 4x x86/MMX/SSE2 TCL"
GL_VERSION    = "1.3 Mesa 6.5.2"
GL_VENDOR     = "Tungsten Graphics, Inc."
GL_EXTENSIONS = "GL_ARB_imaging GL_ARB_multisample GL_ARB_multitexture GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_mirrored_repeat GL_ARB_texture_rectangle GL_ARB_transpose_matrix GL_ARB_window_pos GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_logic_op GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_clip_volume_hint GL_EXT_compiled_vertex_array GL_EXT_convolution GL_EXT_copy_texture GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_histogram GL_EXT_packed_pixels GL_EXT_polygon_offset GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_stencil_wrap GL_EXT_subtexture GL_EXT_texture GL_EXT_texture3D GL_EXT_texture_edge_clamp GL_EXT_texture_env_add GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_object GL_EXT_texture_rectangle GL_EXT_vertex_array GL_APPLE_packed_pixels GL_ATI_texture_env_combine3 GL_ATI_texture_mirror_once GL_IBM_rasterpos_clip GL_IBM_texture_mirrored_repeat GL_MESA_ycbcr_texture GL_MESA_window_pos GL_NV_blend_square GL_NV_light_max_exponent GL_NV_texture_rectangle GL_NV_texgen_reflection GL_OES_read_format GL_SGI_color_matrix GL_SGI_color_table GL_SGIS_generate_mipmap GL_SGIS_texture_border_clamp GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod"

Unhandled exception
 Condition components:
   1. &assertion
   2. &who: inexact
   3. &message: "not a number"
   4. &irritants: ("
----------------------------------------------------------------------

Ed

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