+printf "Checking for GL/gl.h... "
+have_gl=0
+if pkg-config --exists gl; then
+ printf "Yes.\n"
+ have_gl=1
+ gl_cflags=$(pkg-config --cflags gl)
+ gl_ldflags=$(pkg-config --libs gl)
+else
+ printf"No.\n"
+ have_gl=0
+ errors=$((errors + 1))
+fi
+
+printf "Checking for GL window-system-binding headers:\n"
+have_gl_winsys=0
+
+printf " Checking for GL/glx.h... "
+have_glx=No
+printf "#include <GL/glx.h>\nint main(void){return 0;}\n" > glx-minimal.c
+if ${CC} -o glx-minimal glx-minimal.c ${gl_cflags} > /dev/null 2>&1
+then
+ printf "Yes.\n"
+ have_gl_winsys=1
+ have_glx=Yes
+else
+ printf "No.\n"
+fi
+rm -f glx-minimal glx-minimal.c
+
+if [ $have_gl_winsys -eq 0 ]; then
+ errors=$((errors + 1))
+fi
+
+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 "No.\n"
+fi
+
+printf " Checking for GLESv2... "
+have_glesv2=No
+if pkg-config --exists glesv2; then
+ printf "Yes.\n"
+ have_glesv2=Yes
+ glesv2_cflags=$(pkg-config --cflags glesv2)
+ glesv2_ldflags=$(pkg-config --libs glesv2)
+else
+ printf "No.\n"
+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
+ cat <<EOF
+
+* Warning: Cannot create both 32 and 64-bit fips libraries. Fips will not
+ support applications of the non-native size. Fixing this may be
+ as simple as running a command such as:
+
+ sudo apt-get install gcc-multilib
+EOF
+fi
+
+rm -f arch-minimal arch-minimal.c
+