0:6(12): error: value of type vec3 cannot be assigned to variable of type vec4

source:
attribute vec2 position;
attribute vec3 textureCoords;
varying vec4 texCoords;
void main()
{
   texCoords = textureCoords;
   gl_Position = vec4(position, 0.0, 1.0);
}

This is mesa 8b5f894e13c0e290b2d3218ed8305e7428f2242f on an Intel GM45.
Configure line:
'--prefix' '/opt/gnome' '--libdir' '/opt/gnome/lib64' '--enable-silent-rules' '--disable-static' '--config-cache' '--enable-gtk-doc' '--with-egl-platforms=x11,wayland,drm' '--enable-gbm' '--with-gallium-drivers=swrast,ilo,r300,r600,nouveau,freedreno' '--with-dri-drivers=i965,r200' '--enable-shared-glapi' '--enable-gles2' 'CFLAGS=-g -O2 -Wno-error=deprecated-declarations -Wno-unused-local-typedefs -DG_DISABLE_CAST_CHECKS -pipe' 'LDFLAGS=-L/opt/gnome/lib64 -fuse-linker-plugin -pipe' 'CXXFLAGS=-g -O2 -Wno-error=deprecated-declarations -Wno-unused-local-typedefs -DG_DISABLE_CAST_CHECKS -pipe' 'PKG_CONFIG_PATH=/opt/gnome/lib64/pkgconfig:/opt/gnome/share/pkgconfig:/usr/lib64/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig' '--enable-opencl' '--with-clang-libdir=/usr/lib' '--enable-vdpau'

The failing program is gnome-maps (v3.11.90), with libchamplain (LIBCHAMPLAIN_0_12_7-1-geb40691) and cogl (1.17.2-17-gf9cd179)