[linux-audio-user] Rotter and JACK install issues...

So I found the answer to my prayers, Rotter... Before I downloaded it, I installed jackd ver. 0.101.1 on my ubuntu box. So I downloaded the source, did the typical gunzip and tar -xvf then ./configure of the beast and I get this: mlyon@kkup-audio:/rotter-0.1$ sudo ./configure checking build system type... i686-pc-linux-gnu checking host system type... i686-pc-linux-gnu checking target system type... i686-pc-linux-gnu checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for gawk... gawk checking whether make sets $(MAKE)... yes checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ANSI C... none needed checking for style of include used by make... GNU checking dependency style of gcc... gcc3 checking for a BSD-compatible install... /usr/bin/install -c checking whether ln -s works... yes checking for inline... inline checking for sqrt in -lm... yes checking for lrintf in -lm... yes checking for powf in -lmx... no checking for pkg-config... /usr/bin/pkg-config checking pkg-config is at least version 0.9.0... yes checking for JACK_CFLAGS... checking for JACK_LIBS... configure: error: Package requirements (jack >= 0.100.0) were not met. Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively you may set the JACK_CFLAGS and JACK_LIBS environment variables to avoid the need to call pkg-config. See the pkg-config man page for more details. The powf I believe is required if I was going to use mpg2, which I am not. Going to be MP3. But the issue I am wondering about is the: configure: error: Package requirements (jack >= 0.100.0) were not met. Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. I am running jack ver 0.101.1. Anyone know what the issue is here? Any help would be appreciated. Thanks, Mike