I've gotten passed that issue (at least on OSX) and am now facing a new issue. Please see this gist for a run down of what's going on -
[https://gist.github.com/zacharycarter/de596b1968b63f2e0967d41b31b73804](https://gist.github.com/zacharycarter/de596b1968b63f2e0967d41b31b73804) void nk_convert(const struct nk_convert_config *config) { printf("%d\n", config->vertex_layout[0].attribute); } is printing 1536 The relevant nim code - {.compile: "test.c".} type nk_size = culong type nk_draw_vertex_layout_attribute* = enum NK_VERTEX_POSITION, NK_VERTEX_COLOR, NK_VERTEX_TEXCOORD, NK_VERTEX_ATTRIBUTE_COUNT type nk_draw_vertex_layout_format* = enum NK_FORMAT_SCHAR, NK_FORMAT_SSHORT, NK_FORMAT_SINT, NK_FORMAT_UCHAR, NK_FORMAT_USHORT, NK_FORMAT_UINT, NK_FORMAT_FLOAT, NK_FORMAT_DOUBLE, NK_FORMAT_COLOR_BEGIN, NK_FORMAT_R16G15B16, NK_FORMAT_R32G32B32, NK_FORMAT_R8G8B8A8, NK_FORMAT_R16G15B16A16, NK_FORMAT_R32G32B32A32, NK_FORMAT_R32G32B32A32_FLOAT, NK_FORMAT_R32G32B32A32_DOUBLE, NK_FORMAT_RGB32, NK_FORMAT_RGBA32, NK_FORMAT_COUNT type nk_draw_vertex_layout_element* = object attribute*: nk_draw_vertex_layout_attribute format*: nk_draw_vertex_layout_format offset*: nk_size type nk_convert_config* = object vertex_layout*: ptr nk_draw_vertex_layout_element proc nk_convert*(a6: ptr nk_convert_config) {.cdecl, importc: "nk_convert".} type nk_byte* = cuchar template offsetof(typ, field): expr = (var dummy: typ; cast[uint](addr(dummy.field)) - cast[uint](addr(dummy))) type nk_glfw_vertex = object position: array[2, float] uv: array[2, float] col: array[4, nk_byte] var config = nk_convert_config() var vertex_layout {.global.} = @[ nk_draw_vertex_layout_element( attribute: NK_VERTEX_POSITION, format: NK_FORMAT_FLOAT, offset: offsetof(nk_glfw_vertex, position) ), nk_draw_vertex_layout_element( attribute: NK_VERTEX_TEXCOORD, format: NK_FORMAT_FLOAT, offset: offsetof(nk_glfw_vertex, uv) ), nk_draw_vertex_layout_element( attribute: NK_VERTEX_COLOR, format: NK_FORMAT_FLOAT, offset: offsetof(nk_glfw_vertex, col) ), nk_draw_vertex_layout_element( attribute: NK_VERTEX_ATTRIBUTE_COUNT, format: NK_FORMAT_COUNT, offset: 0 ) ] config.vertex_layout = addr vertex_layout[0] nk_convert(addr config)
