First try to:
brew update 
then:
brew install tesseract --HEAD

I've just installed it on my private mac this way and tesseract is 4.0 
(still beta though):
tesseract --version
tesseract 4.0.0-beta.3
 leptonica-1.76.0
  libjpeg 9c : libpng 1.6.35 : libtiff 4.0.9 : zlib 1.2.11
 Found AVX
 Found SSE


If this doesn't help, you may want to remove the old version of tesseract 
if this doesn't help.

As the last resort you may run:
brew upgrade

though, it may take hours to complete (it depends how much stuff you have 
installed thru brew)

Good luck :)

On Wednesday, August 1, 2018 at 12:01:45 AM UTC+2, [email protected] wrote:
>
> Thanks a lot. I tried brew install tesseract --HEAD and I still got 
> version 3.05.02
>
> =========================================
> ➜  ~ *brew install tesseract --HEAD*
> Warning: tesseract HEAD-9ce4d05 is already installed and up-to-date
> To reinstall HEAD, run `brew reinstall tesseract`
>
> ➜  ~ *brew reinstall tesseract*
> ==> Reinstalling tesseract
> ==> Cloning https://github.com/tesseract-ocr/tesseract.git
> Updating /Users/czhang/Library/Caches/Homebrew/tesseract--git
> ==> Checking out branch master
> Already on 'master'
> Your branch is up to date with 'origin/master'.
> HEAD is now at 9ce4d05 Merge pull request #1812 from noahmetzger/winfix
> Entering 'googletest'
> Entering 'test'
> ==> ./autogen.sh
> ==> ./configure --prefix=/usr/local/Cellar/tesseract/HEAD-9ce4d05
> ==> make install
> ==> Cloning https://github.com/tesseract-ocr/tessdata_fast.git
> Updating 
> /Users/czhang/Library/Caches/Homebrew/tesseract--tessdata-head--git
> ==> Checking out branch master
> Already on 'master'
> Your branch is up to date with 'origin/master'.
> HEAD is now at 7274cfa Merge pull request #16 from Shreeshrii/master
> 🍺  /usr/local/Cellar/tesseract/HEAD-9ce4d05: 221 files, 673.6MB, built in 
> 2 minutes 34 seconds
>
> ➜  ~ *tesseract -v*
> tesseract *3.05.02*
>  leptonica-1.76.0
>   libgif 5.1.4 : libjpeg 9b : libpng 1.6.34 : libtiff 4.0.9 : zlib 1.2.11 
> : libwebp 0.5.2 : libopenjp2 2.3.0
>
>
> Does any one have this problem? Thanks again.
>
>
>
>
> On Tuesday, July 31, 2018 at 9:42:50 AM UTC-7, PSK wrote:
>>
>> So I didn't know that 4.0 cannot be installed via brew so blindly I 
>> issued this command:
>> brew install tesseract --HEAD
>>
>> and it installed 4.0 :) Why don't you just try.
>>
>>
>>
>> On Tuesday, July 31, 2018 at 6:28:56 PM UTC+2, [email protected] wrote:
>>>
>>> Hi PSK, thanks for your reply. I was following the guide here to compile 
>>> tesseract 4.0
>>> https://github.com/tesseract-ocr/tesseract/issues/1453
>>>
>>> It said we cannot install 4.0 through brew install.
>>>
>>> On Tuesday, July 31, 2018 at 12:46:59 AM UTC-7, PSK wrote:
>>>>
>>>> Don't know if it helps, but a couple of days ago I installed Tesseract 
>>>> 4 on macOS HighSierra using brew and this command:
>>>> brew install tesseract --HEAD
>>>>
>>>> I had to symlink liblep to proper location (don't remember if it was 
>>>> per Tesseract per se, or it was for Tess4j though):
>>>> sudo ln -s /usr/local/lib/liblept.5.dylib /opt/local/lib/liblept.4.dylib
>>>>
>>>> How did you install Tesseract on Mac?
>>>>
>>>> On Tuesday, July 31, 2018 at 7:34:49 AM UTC+2, [email protected] 
>>>> wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> I am new to Tesseract 4.0. Very glad to see you guys are here. I am 
>>>>> trying to follow the link below to complie Tesseract 4.0 on my Mac. 
>>>>> However, I got the out put in the final "make training" step, which 
>>>>> yields 
>>>>> "Need to reconfigure project, so there are no errors". Did anybody have 
>>>>> this same problem?
>>>>>
>>>>> Also, when I run "tessearct -v", it generates:
>>>>>
>>>>> ➜  tesseract git:(master) tesseract -v
>>>>> tesseract 3.05.02
>>>>>  leptonica-1.76.0
>>>>>  libgif 5.1.4 : libjpeg 9b : libpng 1.6.34 : libtiff 4.0.9 : zlib 
>>>>> 1.2.11 : libwebp 0.5.2 : libopenjp2 2.3.0
>>>>>
>>>>> It seems I still get version 3.05. 
>>>>>
>>>>> Best,
>>>>> Charlie
>>>>>
>>>>

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