In my case, that happened because icu4c was upgraded to version 63 but my locally installed postgres image still referenced icu4c 62.1. Therefore I had to change the icu4c version used:

 brew info icu4c
 brew switch icu4c <version>

Where version is the installed version returned by info.

I am actually quite surprised that this solution has not been presented yet, and I feel like it is the easiest solution.

Go to GitHub, find the version of the brewfile that matches the version of icu4c that you need and get the raw version of the file (follow the links above and click View File then Raw).

Then just have brew reinstall from that url.

For example, version 62.1:

brew reinstall 

For example, version 64.2:

brew reinstall 

UPDATE:

Later versions of Homebrew may require you to download the file first. If this is the case:

wget 
brew reinstall icu4c.rb

Turns out I, like @Grey Black, had to actually install v62.1 of icu4c. Nothing else worked.

However, brew switch icu4c 62.1 only works if you have installed 62.1 in the past. If you haven't there's more legwork involved. Homebrew does not make it easy to install previous versions of formulae.

Here's how I did it:

1. We first need a deep clone of the Homebrew repo. This may take a while: git -C $(brew --repo homebrew/core) fetch --unshallow
2. brew log icu4c to track down a commit that references 62.1; 575eb4b does the trick.
3. cd $(brew --repo homebrew/core)
4. git checkout 575eb4b -- Formula/icu4c.rb
5. brew uninstall --ignore-dependencies icu4c
6. brew install icu4c You should now have the correct version of the dependency! Now just to...
7. git reset && git checkout . Cleanup your modified recipe.
8. brew pin icu4c Pin the dependency to prevent it from being accidentally upgraded in the future

If you decide you do want to upgrade it at some point, make sure to run brew unpin icu4c

Run npm version, if you see the same error, upgrade npm.

brew upgrade npm.

==> Upgrading 1 outdated package, with result:
npm 8.1.2 -> 10.3.0
==> Upgrading npm
==> Installing dependencies for node: icu4c
==> Installing node dependency: icu4c

Credits

I had the same problem after I upgraded my macOS to version 10.13.6. I can't run composer and php commands. After researching for a while and trying various solutions posted online, reinstalling php using homebrew worked.

brew reinstall php@7.1

Added on March 14th based on Ryan's comment

get the version you are currently using by running php -v and get the right formulae (which you can find here: ) to replace @7.1 in the above command.

This fixed it for me:

brew upgrade node

For me the solution was to:

brew reinstall icu4c

Then

gem uninstall charlock_holmes
gem install charlock_holmes

Seems like it is impossible to link icu4c using brew after latest OS X update. Which makes things more interesting. The only solution I found working for me:

1. Download and compile icu4c 62.1 to /usr/local/icu4c/62.1

mkdir ~/sources
cd ~/sources
wget 
tar xvzf icu4c-62_1-src.tgz
cd icu/source/

sudo mkdir /usr/local/icu4c/62.1
./configure --prefix=/usr/local/icu4c/62.1
make
sudo make install

2. Link libs:

ln -s /usr/local/icu4c/62.1/lib/*.dylib /usr/local/include/

3. Set DYLD_LIBRARY_PATH in ~/.bash_profile:

export DYLD_LIBRARY_PATH=/usr/local/include

I actually tried all of the solutions which made sense, mentioned in this post and yet i still got the same error when running php -v or composer. The node version was fine, npm as well there were no issues on having installed correct versions and they were all running. Running reinstall php@7.1 just threw an error. In the end i had to run:

brew reinstall icu4c

This basically worked, with me having to manually then install php dependencies such as imagick.so, imap.so As these libraries were installed for a project that i no longer maintain i can go without them. But if you do have dependancies on them, have in mind that there will be more work to do afterwards.

Just brew remove php and brew install php did not work, nor did brew reinstall php. My solution was to do:

brew remove php
cd /usr/local/Cellar
rm -rf php/
brew install php
brew doctor
brew cleanup

Now php -v gives me:

PHP 7.3.2 (cli) (built: Feb 14 2019 10:08:45) ( NTS )

my issue:

# npm install -g canvas

dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.64.dylib
  Referenced from: /usr/local/opt/node@8/bin/node
  Reason: image not found

for now 20210118, after many try:

...
brew reinstall 
brew upgrade npm
brew install node
brew uninstall --ignore-dependencies node@8 icu4c
brew install icu4c
...

Final worked solution is:

brew reinstall npm

Actually, I found the solution directly on homebrew page:

Upgrading macOS can cause errors like the following:

• dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.54.dylib configure: error: Cannot find libz
• Following a macOS upgrade it may be necessary to reinstall the Xcode Command Line Tools and brew upgrade all installed formula:

xcode-select --install
brew upgrade

In my case the problem wasn't related to upgrading OS, but the solution worked nicely.

2021-02 Easy solution

After years of dealing with this problem the following, surprisingly easy, solution worked for me:

1. Open the raw file in your web browser of the version you need:

Version 62:

Version 64:

Version 66:

Version 67:

Latest version:

2. Copy paste the contents into a new file named: icu4c.rb
3. Run the following on the newly created file: brew reinstall icu4c.rb

Source:

For me brew reinstall nodejs fixed this - my issue was with running Elixir/Phoenix so not PHP specific, I think it was caused by brew install postgres, but reinstalling that didn't help. I was getting it from npm commands.

In order to downgrade, i had to recompile from source (MacOS Mojave)

$ wget 
$ tar xvfz icu4c-62_1-src.tgz
$ cd icu/sources
$ ./configure
$ make
$ make install

brew update && brew upgrade worked for me

This is what finally worked for me.

brew reinstall postgres

After running the above command you might need to run

brew postgresql-upgrade-database

to access your previous data.

i followed this article here and this seems to be the missing piece of the puzzle for me:

brew uninstall node@8

Rather than install an old version of icu4c that the older (precompiled) php can link to, it's better to recompile the old php to link to the more recent library.

brew uninstall php@7.2
brew install --build-from-source php@7.2

This will build php and link it to the newer library. I found reinstall didn't quite work; the new install choked when the destination folder already existed.

I also did brew link --force php@7.2 for my environment.

I had problems because my version of PHP (7.3) was expecting icu4c 63 and brew would only install 64.

helped me install 63.

On MacOS Mojave, only way I could fix it was with brew upgrade

On OSX 10.15.4 running xcode-select --install fixed the issue for me.

Leland's answer worked for me, but I had to change steps 4 and 6 to:

4) git checkout -B icu4c-62.1 575eb4b

6) brew reinstall Formula/icu4c.rb

The solution in this gist did it for me

brew uninstall --ignore-dependencies node icu4c
brew install node

In my case, brew update icu4c to version 67.1 so my php7.1 doesn't work. Just reinstall icu4c, then it fine.

Ref this:

Got this error, too, after installing php 7.3. I had it resolved upgrading just my old php's versions (5.6 and 7.0, not from the official repos).

The maintainers had compiled new php versions against the current icu4c.

In my case, PHP 7 got from 0.31 to 0.33, and the problem was solved.

In my case I had to switch between two versions of icu4c since I still maintain PHP 5.6 projects (which use the old icu4c 64.2). brew install and reinstall from raw .rb links always replaces the previously installed versions for some reason.

#fetching 64.2
brew fetch  

#fetching stable version
brew fetch  

cd $(brew --cache)/downloads
tar xvfz e2a83648f37dc5193016ce14fa6faeb97460258b214e805b1d7ce8956e83c1a7--icu4c-64.2.catalina.bottle.tar.gz
tar xvfz e045a709e2e21df31e66144a637f0c77dfc154f60183c89e6b04afa2fbda28ba--icu4c-67.1.catalina.bottle.tar.gz
mv -n icu4c/67.1 $(brew --cellar)/icu4c/
mv -n icu4c/64.2 $(brew --cellar)/icu4c/

then switch between versions

$ brew switch icu4c 64.2
Cleaning /usr/local/Cellar/icu4c/64.2
Cleaning /usr/local/Cellar/icu4c/67.1
Opt link created for /usr/local/Cellar/icu4c/64.2

$ brew switch icu4c 67.1
Cleaning /usr/local/Cellar/icu4c/64.2
Cleaning /usr/local/Cellar/icu4c/67.1
Opt link created for /usr/local/Cellar/icu4c/67.1

[2020] edition

For me, it was installing icu4c with the needed version.

If you need to install the old version like version 62, (same steps for else versions), you need to:

1. Create your own repo (or find someones repo) with this version of brew tap (links are different for every version):

version 62

version 64

version 66

version 67

2. [yourUsername]/homebrew-versions/Formula/
3. Place downloaded file to 'Formula' folder
4. brew tap [yourUsername]/homebrew-versions
5. brew install [yourUsername]/homebrew-versions/icu4c
6. You got it!

Where [yourUsername] is the name of your GitHub account or person who already have the needed version tap.

Unfortunately, latest homebrew gives no longer a warning and now displays the error: Error: Calling Installation of XXX from a GitHub commit URL is disabled! Use 'brew extract XXX' to stable tap on GitHub instead. So the way to go now is to create a new repo on github called homebrew-versions to host the Formula in a Tap Then initialise it with: brew tap-new MYORG/homebrew-versions after git cloning the homebrew repo as suggested by Shine Hugh, copy paste the raw ruby file to your new Formula. Beware the funny naming convention! Example: File name is: Class name is: GettextAT0202 Example:

source:

I just wanted to leave a detail summary on how to fix this issue at the current moment (this worked for me):

First go to the local installation of homebrew

cd /usr/local/Homebrew/

Homebrew > 2.5 remove the option to install formulas directly from git repos so we need to checkout an older version

git checkout 2.3.0

Install icu4c version (in my case 64.2 was compitable with php@7.1)

HOMEBREW_NO_AUTO_UPDATE=1 brew install 

Go back to current version of homebrew

git checkout -

Tell brew to use the old version of icu4c this way you can chose wich version to use if you have both intalled

brew switch icu4c 64.2