1. checking if gcc supports -c -o file.o... yes
2. checking if gcc supports -c -o file.o... (cached) yes
3. checking whether the gcc linker (/usr/bin/x86_64-linux-gnu-ld -m elf_x86_64) supports shared libraries... yes
4. checking whether -lc should be explicitly linked in... no
5. checking dynamic linker characteristics... GNU/Linux ld.so
6. checking how to hardcode library paths into programs... immediate
7. checking whether stripping libraries is possible... yes
8. checking if libtool supports shared libraries... yes
9. checking whether to build shared libraries... yes
10. checking whether to build static libraries... yes
11. checking whether make supports nested variables... (cached) yes
12. checking if gcc supports -std=c89 flag... yes
13. checking if gcc supports -pedantic flag... yes
14. checking if gcc supports -Wall flag... yes
15. checking if gcc supports -Wextra flag... yes
16. checking if gcc supports -Wno-parentheses flag... yes
17. checking if gcc supports -Wno-long-long flag... yes
18. checking sys/socket.h usability... yes
19. checking sys/socket.h presence... yes
20. checking for sys/socket.h... yes
21. checking for library containing ftime... none required
22. checking for pkg-config... /usr/bin/pkg-config
23. checking pkg-config is at least version 0.9.0... yes
24. checking for URL_DEPS... yes
25. checking for DEPS... no
26. configure: error: Package requirements (ogg >= 1.3 opus >= 1.0.1) were not met:
27.  
28. No package 'opus' found
29.  
30. Consider adjusting the PKG_CONFIG_PATH environment variable if you
31. installed software in a non-standard prefix.
32.  
33. Alternatively, you may set the environment variables DEPS_CFLAGS
34. and DEPS_LIBS to avoid the need to call pkg-config.
35. See the pkg-config man page for more details.
36. yeti@ubuntu:~/Downloads/opusfile-0.9$
37.  
38.  
39. So I checked the man page for pkg-config:
40. Some influential environment variables:
41.   CC          C compiler command
42.   CFLAGS      C compiler flags
43.   LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
44.               nonstandard directory <lib dir>
45.   LIBS        libraries to pass to the linker, e.g. -l<library>
46.   CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
47.               you have headers in a nonstandard directory <include dir>
48.   CPP         C preprocessor
49.   LT_SYS_LIBRARY_PATH
50.               User-defined run-time library search path.
51.   PKG_CONFIG  path to pkg-config utility
52.   PKG_CONFIG_PATH
53.               directories to add to pkg-config's search path
54.   PKG_CONFIG_LIBDIR
55.               path overriding pkg-config's built-in search path
56.   URL_DEPS_CFLAGS
57.               C compiler flags for URL_DEPS, overriding pkg-config
58.   URL_DEPS_LIBS
59.               linker flags for URL_DEPS, overriding pkg-config
60.   DEPS_CFLAGS C compiler flags for DEPS, overriding pkg-config
61.   DEPS_LIBS   linker flags for DEPS, overriding pkg-config
62.  
63. Use these variables to override the choices made by `configure' or to help
64. it to find libraries and programs with nonstandard names/locations.
65.  
66.  
67. Not sure where to point deps_libs or url_deps_libs so opus can compile.
68.