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Here is 5 steps Alchemy installation guide for Windows. It was tested under Windows XP Professional and Windows 7 Home Edition.

Step 1: Downloading

Dowload the following resources:

1. Java (JRE Windows x86),
2. Cygwin,
3. Alchemy,
4. Flex SDK.

Official getting started says that you need Flex SDK 3.2 but it works fine with higher SDKs.

Step 2: Installing and extracting

1. Install Java
2. Instal Cygwin to c:/alchemy/cygwin
3. Extract Alchemy to c:/alchemy/alchemy0.5a
4. Extract Flex SDK to c:/alchemy/flex4.5

Step 3: Setting Cygwin paths

1. Open Cygwin console. If you do it for the first time your home directory will be created in c:/alchemy/cygwin/home/$USER.
2. Edit c:/alchemy/cygwin/home/.bashrc file and add the following code at the end of it:
   export FLEX_HOME=/cygdrive/c/alchemy/flex4.5/bin
   export ALCHEMY_HOME=/cygdrive/c/alchemy/alchemy0.5a
   
   source /cygdrive/c/alchemy/alchemy0.5a/alchemy-setup
   
   PATH=$ALCHEMY_HOME/achacks:$FLEX_HOME:$PATH
   export PATH
3. Restart console. You will get the following warning but ignore it (alchemy-setup will be created in the next step):
   bash: /cygdrive/c/alchemy/alchemy0.5a/alchemy-setup: No such file or directory

   Type:

   echo $PATH

   and check if you have the following paths at the beginning of your $PATH variable:

   /cygdrive/c/alchemy/alchemy0.5a/achacks
   /cygdrive/c/alchemy/flex4.5/bin

Step 4: Configuring Alchemy

1. Open Cygwin console, go to Alchemy home directory:
   cd $ALCHEMY_HOME

   and run configuration script:

   ./config
2. Edit c:/achemy/alchemy0.5a/alchemy-setup and under line:
   #export ADL=/path/to/your/adl (or adl.exe)

   add

   export ADL=/cygdrive/c/alchemy/flex4.5/bin/adl.exe
3. Go to the $ALCHEMY_HOME/bin directory:
   cd $ALCHEMY_HOME/bin

and create symbolic link to the llvm-stub.exe:

ln -s llvm-stub llvm-stub.exe
4. Restart Cygwin console and type again:
   echo $PATH

   and this time you shoud have one more path printed:

   /cygdrive/c/alchemy/alchemy0.5a/bin

   Type:

   which gcc

   and you should get:

   /cygdrive/c/alchemy/alchemy/0.5a/achacks/gcc

Step 5: Compiling C program into SWC

Go to the directory with sample C programs:
cd $ALCHEMY_HOME/samples/stringecho

and type:

gcc stringecho.c -O3 -Wall -swc -o stringecho.swc

You should get output similar to:

WARNING: While resolving call to function 'main' arguments were dropped!

3144.achacks.swf, 261075 bytes written
frame rate: 60
frame count: 1
69 : 4
72 : 261005
76 : 33
1 : 0
0 : 0
frame rate: 24
frame count: 1
69 : 4
77 : 506
64 : 31
63 : 16
65 : 4
9 : 3
41 : 26
82 : 471
1 : 0
0 : 0
  adding: catalog.xml (deflated 75%)
  adding: library.swf (deflated 70%)

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