gnupg tries to build with non-existent libusb

[Mike Castle]

Strange goings on.  Tried this with 1.4.0, 1.9.13 and 1.9.14.  Results all
the same.

if i486-linux-gcc -DHAVE_CONFIG_H -I. -I../../gnupg-1.9.14/scd -I..  -I../../gnupg-1.9.14/intl -I../../gnupg-1.9.14/common -DLOCALEDIR=\"/usr/share/locale\" -DGNUPG_BINDIR="\"/usr/bin\"" -DGNUPG_LIBEXECDIR="\"/usr/libexec\"" -DGNUPG_LIBDIR="\"/usr/lib/gnupg\"" -DGNUPG_DATADIR="\"/usr/share/gnupg\""           -I/usr/include -g -O2 -Wall -MT ccid-driver.o -MD -MP -MF ".deps/ccid-driver.Tpo" -c -o ccid-driver.o ../../gnupg-1.9.14/scd/ccid-driver.c; \
then mv -f ".deps/ccid-driver.Tpo" ".deps/ccid-driver.Po"; else rm -f ".deps/ccid-driver.Tpo"; exit 1; fi
../../gnupg-1.9.14/scd/ccid-driver.c:85:17: usb.h: No such file or directory

Hmm... I'd installed libusb at sometime in the past, and removed the header
files, but forgot the remove the libraries.

Configure should probably check for a working usb.h in addition to libusb
(guess this might qualify for a situation where someone forgot include
libusb-devel or whatever on their system).

mrc
-- 
     Mike Castle      dalgoda at ix.netcom.com      www.netcom.com/~dalgoda/
    We are all of us living in the shadow of Manhattan.  -- Watchmen
fatal ("You are in a maze of twisty compiler features, all different"); -- gcc