MacOS – How to link back to the correct C compiler

While trying to install fink-0.38.4 I get the ERROR: There is no C compiler on your system. Make sure that the Developer Tools are installed.

I have got errors about missing a C compiler while trying to install some other things too, but I don't remember which packets that were.

I am a designer and need to install a packet called Emokit, but I am totally oblivious to all these open source things I had to install. I am in way over my head, which is why I made a giant mess. To name some stuff I have installed in the last couple of days: MacPorts, Homebrew, Xcode, X11, FoxToolkit, hidapi (maybe, I am not sure if I installed this correctly or not), python, cython, and a couple more and some libraries as well. While doing this I have learned what some things are. I know now that MacPorts and Homebrew serve a similar purpose and having them both is making trouble. However I don't dare to delete one of them because I think some stuff relies on them.

I have multiple versions of GCC, but because some installations wanted a different version, I tried to switch from one version to another version some times. It sometimes worked and sometimes didn't. I forgot how I changed it and now I can't seem to change it back.

I have made a mess and now I have no clue at all on how to fix it.

I am running OS X 10.10.3.

echo $PATH gives (in a list for easier reading)

/usr/local/bin/gcc:
/usr/bin/cc:
/usr/local/bin:
/usr/bin/gcc:
/usr/local/bin:
/Applications/Xcode.app/Contents/Developer/usr/bin:
/Library/Frameworks/Python.framework/Versions/3.4/bin:
/Users/rick/.cabal/bin:
/Applications/ghc-7.10.1.app/Contents/bin:
/Users/rick/.cabal/bin:
/Applications/ghc-7.10.1.app/Contents/bin:
/opt/local/bin:
/opt/local/sbin:
/usr/local/bin:
/usr/bin:
/bin:
/usr/sbin:
/sbin:
/opt/X11/bin

gcc -v gives

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-apple-darwin14.0.0/4.9.2/lto-wrapper
Target: x86_64-apple-darwin14.0.0
Configured with: ../gcc-4.9-20141029/configure --enable-languages=c++,fortran
Thread model: posix
gcc version 4.9.2 20141029 (prerelease) (GCC) 

whereis gcc gives me nothing at the moment. This used to be /usr/bin/gcc

which gcc gives /usr/local/bin/gcc

ls -al $(dirname $(which gcc)) | grep 'gcc\|g++\|c++' (I have no clue what this does actually) gives:

lrwxr-xr-x    1 rick  admin       41 May  7 10:43 aot-compile-4.7 -> ../Cellar/gcc47/4.7.4/bin/aot-compile-4.7
lrwxr-xr-x    1 rick  admin       46 May  7 14:07 c++-4.2 -> ../Cellar/apple-gcc42/4.2.1-5666.3/bin/c++-4.2
lrwxr-xr-x    1 rick  admin       33 May  7 10:43 c++-4.7 -> ../Cellar/gcc47/4.7.4/bin/c++-4.7
lrwxr-xr-x    1 rick  admin       33 May  7 16:11 c++-4.9 -> ../Cellar/gcc/4.9.2_1/bin/c++-4.9
lrwxr-xr-x    1 rick  admin       46 May  7 14:07 cpp-4.2 -> ../Cellar/apple-gcc42/4.2.1-5666.3/bin/cpp-4.2
lrwxr-xr-x    1 rick  admin       33 May  7 10:43 cpp-4.7 -> ../Cellar/gcc47/4.7.4/bin/cpp-4.7
lrwxr-xr-x    1 rick  admin       33 May  7 16:11 cpp-4.9 -> ../Cellar/gcc/4.9.2_1/bin/cpp-4.9
-rwxr-xr-x    1 root  wheel  1166504 Nov  3  2014 g++
lrwxr-xr-x    1 rick  admin       46 May  7 14:07 g++-4.2 -> ../Cellar/apple-gcc42/4.2.1-5666.3/bin/g++-4.2
lrwxr-xr-x    1 rick  admin       33 May  7 10:43 g++-4.7 -> ../Cellar/gcc47/4.7.4/bin/g++-4.7
lrwxr-xr-x    1 rick  admin       33 May  7 16:11 g++-4.9 -> ../Cellar/gcc/4.9.2_1/bin/g++-4.9
lrwxr-xr-x    1 rick  admin       43 May  7 10:43 gappletviewer-4.7 -> ../Cellar/gcc47/4.7.4/bin/gappletviewer-4.7
lrwxr-xr-x    1 rick  admin       36 May  1 13:46 gc++filt -> ../Cellar/binutils/2.25/bin/gc++filt
lrwxr-xr-x    1 rick  admin       40 May  7 10:43 gc-analyze-4.7 -> ../Cellar/gcc47/4.7.4/bin/gc-analyze-4.7
-rwxr-xr-x    1 root  wheel  1166328 Nov  3  2014 gcc
lrwxr-xr-x    1 rick  admin       46 May  7 14:07 gcc-4.2 -> ../Cellar/apple-gcc42/4.2.1-5666.3/bin/gcc-4.2
lrwxr-xr-x    1 rick  admin       33 May  7 10:43 gcc-4.7 -> ../Cellar/gcc47/4.7.4/bin/gcc-4.7
lrwxr-xr-x    1 rick  admin       33 May  7 16:11 gcc-4.9 -> ../Cellar/gcc/4.9.2_1/bin/gcc-4.9
-rwxr-xr-x    1 root  wheel    43016 Nov  3  2014 gcc-ar
lrwxr-xr-x    1 rick  admin       36 May  7 10:43 gcc-ar-4.7 -> ../Cellar/gcc47/4.7.4/bin/gcc-ar-4.7
lrwxr-xr-x    1 rick  admin       36 May  7 16:11 gcc-ar-4.9 -> ../Cellar/gcc/4.9.2_1/bin/gcc-ar-4.9
-rwxr-xr-x    1 root  wheel    42992 Nov  3  2014 gcc-nm
lrwxr-xr-x    1 rick  admin       36 May  7 10:43 gcc-nm-4.7 -> ../Cellar/gcc47/4.7.4/bin/gcc-nm-4.7
lrwxr-xr-x    1 rick  admin       36 May  7 16:11 gcc-nm-4.9 -> ../Cellar/gcc/4.9.2_1/bin/gcc-nm-4.9
-rwxr-xr-x    1 root  wheel    43000 Nov  3  2014 gcc-ranlib
lrwxr-xr-x    1 rick  admin       40 May  7 10:43 gcc-ranlib-4.7 -> ../Cellar/gcc47/4.7.4/bin/gcc-ranlib-4.7
lrwxr-xr-x    1 rick  admin       40 May  7 16:11 gcc-ranlib-4.9 -> ../Cellar/gcc/4.9.2_1/bin/gcc-ranlib-4.9
lrwxr-xr-x    1 rick  admin       33 May  7 10:43 gcj-4.7 -> ../Cellar/gcc47/4.7.4/bin/gcj-4.7
lrwxr-xr-x    1 rick  admin       40 May  7 10:43 gcj-dbtool-4.7 -> ../Cellar/gcc47/4.7.4/bin/gcj-dbtool-4.7
lrwxr-xr-x    1 rick  admin       34 May  7 10:43 gcjh-4.7 -> ../Cellar/gcc47/4.7.4/bin/gcjh-4.7
lrwxr-xr-x    1 rick  admin       47 May  7 14:07 gcov-4.2 -> ../Cellar/apple-gcc42/4.2.1-5666.3/bin/gcov-4.2
lrwxr-xr-x    1 rick  admin       34 May  7 10:43 gcov-4.7 -> ../Cellar/gcc47/4.7.4/bin/gcov-4.7
lrwxr-xr-x    1 rick  admin       34 May  7 16:11 gcov-4.9 -> ../Cellar/gcc/4.9.2_1/bin/gcov-4.9
lrwxr-xr-x    1 rick  admin       34 May  7 16:11 gfortran -> ../Cellar/gcc/4.9.2_1/bin/gfortran
lrwxr-xr-x    1 rick  admin       51 May  7 14:07 gfortran-4.2 -> ../Cellar/apple-gcc42/4.2.1-5666.3/bin/gfortran-4.2
lrwxr-xr-x    1 rick  admin       38 May  7 10:43 gfortran-4.7 -> ../Cellar/gcc47/4.7.4/bin/gfortran-4.7
lrwxr-xr-x    1 rick  admin       38 May  7 16:11 gfortran-4.9 -> ../Cellar/gcc/4.9.2_1/bin/gfortran-4.9
lrwxr-xr-x    1 rick  admin       33 May  7 10:43 gij-4.7 -> ../Cellar/gcc47/4.7.4/bin/gij-4.7
lrwxr-xr-x    1 rick  admin       34 May  7 10:43 gjar-4.7 -> ../Cellar/gcc47/4.7.4/bin/gjar-4.7
lrwxr-xr-x    1 rick  admin       40 May  7 10:43 gjarsigner-4.7 -> ../Cellar/gcc47/4.7.4/bin/gjarsigner-4.7
lrwxr-xr-x    1 rick  admin       36 May  7 10:43 gjavah-4.7 -> ../Cellar/gcc47/4.7.4/bin/gjavah-4.7
lrwxr-xr-x    1 rick  admin       38 May  7 10:43 gkeytool-4.7 -> ../Cellar/gcc47/4.7.4/bin/gkeytool-4.7
lrwxr-xr-x    1 rick  admin       43 May  7 10:43 gnative2ascii-4.7 -> ../Cellar/gcc47/4.7.4/bin/gnative2ascii-4.7
lrwxr-xr-x    1 rick  admin       35 May  7 10:43 gorbd-4.7 -> ../Cellar/gcc47/4.7.4/bin/gorbd-4.7
lrwxr-xr-x    1 rick  admin       35 May  7 10:43 grmic-4.7 -> ../Cellar/gcc47/4.7.4/bin/grmic-4.7
lrwxr-xr-x    1 rick  admin       35 May  7 10:43 grmid-4.7 -> ../Cellar/gcc47/4.7.4/bin/grmid-4.7
lrwxr-xr-x    1 rick  admin       42 May  7 10:43 grmiregistry-4.7 -> ../Cellar/gcc47/4.7.4/bin/grmiregistry-4.7
lrwxr-xr-x    1 rick  admin       40 May  7 10:43 gserialver-4.7 -> ../Cellar/gcc47/4.7.4/bin/gserialver-4.7
lrwxr-xr-x    1 rick  admin       40 May  7 10:43 gtnameserv-4.7 -> ../Cellar/gcc47/4.7.4/bin/gtnameserv-4.7
lrwxr-xr-x    1 rick  admin       68 May  7 14:07 i686-apple-darwin11-cpp-4.2.1 -> ../Cellar/apple-gcc42/4.2.1-5666.3/bin/i686-apple-darwin11-cpp-4.2.1
lrwxr-xr-x    1 rick  admin       68 May  7 14:07 i686-apple-darwin11-g++-4.2.1 -> ../Cellar/apple-gcc42/4.2.1-5666.3/bin/i686-apple-darwin11-g++-4.2.1
lrwxr-xr-x    1 rick  admin       68 May  7 14:07 i686-apple-darwin11-gcc-4.2.1 -> ../Cellar/apple-gcc42/4.2.1-5666.3/bin/i686-apple-darwin11-gcc-4.2.1
lrwxr-xr-x    1 rick  admin       73 May  7 14:07 i686-apple-darwin11-gfortran-4.2.1 -> ../Cellar/apple-gcc42/4.2.1-5666.3/bin/i686-apple-darwin11-gfortran-4.2.1
lrwxr-xr-x    1 rick  admin       38 May  7 10:43 jcf-dump-4.7 -> ../Cellar/gcc47/4.7.4/bin/jcf-dump-4.7
lrwxr-xr-x    1 rick  admin       40 May  7 10:43 jv-convert-4.7 -> ../Cellar/gcc47/4.7.4/bin/jv-convert-4.7
lrwxr-xr-x    1 rick  admin       44 May  7 10:43 rebuild-gcj-db-4.7 -> ../Cellar/gcc47/4.7.4/bin/rebuild-gcj-db-4.7
lrwxr-xr-x    1 rick  admin       59 May  7 10:43 x86_64-apple-darwin14.3.0-c++-4.7 -> ../Cellar/gcc47/4.7.4/bin/x86_64-apple-darwin14.3.0-c++-4.7
lrwxr-xr-x    1 rick  admin       59 May  7 16:11 x86_64-apple-darwin14.3.0-c++-4.9 -> ../Cellar/gcc/4.9.2_1/bin/x86_64-apple-darwin14.3.0-c++-4.9
lrwxr-xr-x    1 rick  admin       59 May  7 10:43 x86_64-apple-darwin14.3.0-g++-4.7 -> ../Cellar/gcc47/4.7.4/bin/x86_64-apple-darwin14.3.0-g++-4.7
lrwxr-xr-x    1 rick  admin       59 May  7 16:11 x86_64-apple-darwin14.3.0-g++-4.9 -> ../Cellar/gcc/4.9.2_1/bin/x86_64-apple-darwin14.3.0-g++-4.9
lrwxr-xr-x    1 rick  admin       59 May  7 10:43 x86_64-apple-darwin14.3.0-gcc-4.7 -> ../Cellar/gcc47/4.7.4/bin/x86_64-apple-darwin14.3.0-gcc-4.7
lrwxr-xr-x    1 rick  admin       61 May  7 10:43 x86_64-apple-darwin14.3.0-gcc-4.7.4 -> ../Cellar/gcc47/4.7.4/bin/x86_64-apple-darwin14.3.0-gcc-4.7.4
lrwxr-xr-x    1 rick  admin       59 May  7 16:11 x86_64-apple-darwin14.3.0-gcc-4.9 -> ../Cellar/gcc/4.9.2_1/bin/x86_64-apple-darwin14.3.0-gcc-4.9
lrwxr-xr-x    1 rick  admin       61 May  7 16:11 x86_64-apple-darwin14.3.0-gcc-4.9.2 -> ../Cellar/gcc/4.9.2_1/bin/x86_64-apple-darwin14.3.0-gcc-4.9.2
lrwxr-xr-x    1 rick  admin       62 May  7 10:43 x86_64-apple-darwin14.3.0-gcc-ar-4.7 -> ../Cellar/gcc47/4.7.4/bin/x86_64-apple-darwin14.3.0-gcc-ar-4.7
lrwxr-xr-x    1 rick  admin       62 May  7 16:11 x86_64-apple-darwin14.3.0-gcc-ar-4.9 -> ../Cellar/gcc/4.9.2_1/bin/x86_64-apple-darwin14.3.0-gcc-ar-4.9
lrwxr-xr-x    1 rick  admin       62 May  7 10:43 x86_64-apple-darwin14.3.0-gcc-nm-4.7 -> ../Cellar/gcc47/4.7.4/bin/x86_64-apple-darwin14.3.0-gcc-nm-4.7
lrwxr-xr-x    1 rick  admin       62 May  7 16:11 x86_64-apple-darwin14.3.0-gcc-nm-4.9 -> ../Cellar/gcc/4.9.2_1/bin/x86_64-apple-darwin14.3.0-gcc-nm-4.9
lrwxr-xr-x    1 rick  admin       66 May  7 10:43 x86_64-apple-darwin14.3.0-gcc-ranlib-4.7 -> ../Cellar/gcc47/4.7.4/bin/x86_64-apple-darwin14.3.0-gcc-ranlib-4.7
lrwxr-xr-x    1 rick  admin       66 May  7 16:11 x86_64-apple-darwin14.3.0-gcc-ranlib-4.9 -> ../Cellar/gcc/4.9.2_1/bin/x86_64-apple-darwin14.3.0-gcc-ranlib-4.9
lrwxr-xr-x    1 rick  admin       59 May  7 10:43 x86_64-apple-darwin14.3.0-gcj-4.7 -> ../Cellar/gcc47/4.7.4/bin/x86_64-apple-darwin14.3.0-gcj-4.7
lrwxr-xr-x    1 rick  admin       64 May  7 10:43 x86_64-apple-darwin14.3.0-gfortran-4.7 -> ../Cellar/gcc47/4.7.4/bin/x86_64-apple-darwin14.3.0-gfortran-4.7
lrwxr-xr-x    1 rick  admin       64 May  7 16:11 x86_64-apple-darwin14.3.0-gfortran-4.9 -> ../Cellar/gcc/4.9.2_1/bin/x86_64-apple-darwin14.3.0-gfortran-4.9

gcc-4.2 -v gives

couldn't understand kern.osversion `14.3.0'
Using built-in specs.
Target: i686-apple-darwin11
Configured with: /Volumes/Media/Builds/gcc-5666.3/build/obj/src/configure --disable-checking --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++,fortran --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib --build=i686-apple-darwin11 --program-prefix=i686-apple-darwin11- --host=x86_64-apple-darwin11 --target=i686-apple-darwin11 --with-gxx-include-dir=/include/c++/4.2.1
Thread model: posix
gcc version 4.2.1 (Apple Inc. build 5666) (dot 3)

gcc-4.7 -v gives

Using built-in specs.
COLLECT_GCC=gcc-4.7
COLLECT_LTO_WRAPPER=/usr/local/Cellar/gcc47/4.7.4/libexec/gcc/x86_64-apple-darwin14.3.0/4.7.4/lto-wrapper
Target: x86_64-apple-darwin14.3.0
Configured with: ../configure --build=x86_64-apple-darwin14.3.0 --prefix=/usr/local/Cellar/gcc47/4.7.4 --enable-languages=c,c++,fortran,java,objc,obj-c++ --program-suffix=-4.7 --with-gmp=/usr/local/opt/gmp4 --with-mpfr=/usr/local/opt/mpfr2 --with-mpc=/usr/local/opt/libmpc08 --with-ppl=/usr/local/opt/ppl011 --with-cloog=/usr/local/opt/cloog-ppl015 --with-system-zlib --enable-version-specific-runtime-libs --enable-libstdcxx-time=yes --enable-stage1-checking --enable-checking=release --enable-lto --disable-werror --with-pkgversion='Homebrew gcc47 4.7.4 --with-all-languages --with-nls --with-profiled-build' --with-bugurl=https://github.com/Homebrew/homebrew-versions/issues --enable-plugin --with-ecj-jar=/usr/local/opt/ecj/share/java/ecj.jar --enable-multilib
Thread model: posix
gcc version 4.7.4 (Homebrew gcc47 4.7.4 --with-all-languages --with-nls --with-profiled-build) 

This is the message the install helper (https://github.com/fink/scripts/blob/master/srcinstaller/Install%20Fink.tool#L2) gave me:

Checking package... looks good (fink-0.38.4).
Checking system... i386-apple-darwin14.3.0
This system was not released at the time this Fink release was made. 
Prerelease versions of Mac OS X might work with Fink, but there are no guarantees.
Distribution: 10.10
Architecture: x86_64
Checking cc... not found.
ERROR: There is no C compiler on your system. Make sure that the Developer Tools are installed.
logout

[Process completed]

I don't know what more information to give or if this is way too much info. So please ask if you need anything more.
Probably this stuff contains a lot of mistakes and faulty stuff. I don't understand much about this, but in my head the only way to be able to fix this now is to do a clean install of my OS, which is not really a possibility at the moment because I am in the middle of graduating.
Thanks a lot for your help!

EDIT is below

After deleting a lot of gcc's I tried installing fink again: same error.
I tried running this simple Hello, world! script.

#include <stdio.h>

main()
{
printf(“Hello, world!\n”);
return 0;
}

And trying to compile with gcc gave me the following:

Ricks-MacBook-Pro:downloads rick$ gcc -o hello hello.c
couldn't understand kern.osversion `14.3.0'
hello.c: In function ‘main’:
hello.c:5: error: stray ‘\342’ in program
hello.c:5: error: stray ‘\200’ in program
hello.c:5: error: stray ‘\234’ in program
hello.c:5: error: ‘Hello’ undeclared (first use in this function)
hello.c:5: error: (Each undeclared identifier is reported only once
hello.c:5: error: for each function it appears in.)
hello.c:5: error: ‘world’ undeclared (first use in this function)
hello.c:5: error: expected ‘)’ before ‘!’ token
hello.c:5: error: stray ‘\’ in program
hello.c:5: error: stray ‘\342’ in program
hello.c:5: error: stray ‘\200’ in program
hello.c:5: error: stray ‘\235’ in program
Ricks-MacBook-Pro:downloads rick$