+ printf "No.\n"
+fi
+rm -f glx-minimal glx-minimal.c
+
+printf " Checking for X11... "
+have_x11=No
+if pkg-config --exists x11; then
+ printf "Yes.\n"
+ have_x11=Yes
+ x11_cflags=$(pkg-config --cflags x11)
+ x11_ldflags=$(pkg-config --libs x11)
+else
+ printf "No.\n"
+fi
+
+printf " Checking for EGL/egl.h... "
+have_egl=No
+if pkg-config --exists egl; then
+ printf "Yes.\n"
+ have_egl=Yes
+ egl_cflags=$(pkg-config --cflags egl)
+ egl_ldflags=$(pkg-config --libs egl)
+else
+ printf "#include <EGL/egl.h>\nint main(void){return 0;}\n" > egl-minimal.c
+ if ${CC} -o egl-minimal egl-minimal.c ${gl_cflags} > /dev/null 2>&1
+ then
+ printf "Yes.\n"
+ have_gl_winsys=1
+ have_egl=1
+ else
+ printf "No.\n"
+ fi
+ rm -f egl-minimal egl-minimal.c
+fi
+
+if [ $have_gl_winsys -eq 0 ]; then
+ errors=$((errors + 1))
+fi
+
+printf "int main(void){return 0;}\n" > minimal.c
+
+WARN_CFLAGS=""
+printf "Checking for available C compiler warning flags:\n"
+for flag in -Wall -Wextra -Wmissing-declarations; do
+ if ${CC} $flag -o minimal minimal.c > /dev/null 2>&1
+ then
+ WARN_CFLAGS="${WARN_CFLAGS}${WARN_CFLAGS:+ }${flag}"
+ fi
+done
+printf "\t${WARN_CFLAGS}\n"
+
+rm -f minimal minimal.c
+
+printf "#include <features.h>\nint main(void){return 0;}\n" > arch-minimal.c
+
+printf "Checking for machine-dependent compiler support:\n"
+
+printf " Compiler can create 32-bit binaries... "
+have_m32=Yes
+if ${CC} -m32 -o arch-minimal arch-minimal.c > /dev/null 2>&1
+then
+ printf "Yes.\n"
+else
+ printf "No.\n"
+ have_m32=No
+fi
+
+printf " Compiler can create 64-bit binaries... "
+have_m64=Yes
+if ${CC} -m64 -o arch-minimal arch-minimal.c > /dev/null 2>&1
+then
+ printf "Yes.\n"
+else
+ printf "No.\n"
+ have_m64=No
+fi
+
+if [ "$have_m32" = "No" ] || [ "$have_m64" = "No" ]; then