How to make rpm auto install dependencies

Question

I have built two RPM packages

• proj1-1.0-1.x86_64.rpm
• libtest1-1.0-1.x86_64.rpm

proj1 depends on

Answer 1

In the case of openSUSE Leap 15, I'm receiving similar error:

> sudo rpm -i opera-stable_53.0.2907.68_amd64.rpm 
[sudo] password for root: 
warning: opera-stable_53.0.2907.68_amd64.rpm: Header V4 RSA/SHA512 Signature, key ID a5c7ff72: NOKEY
error: Failed dependencies:
    at is needed by opera-stable-53.0.2907.68-0.x86_64

I run this command to figure out what are the dependencies:

> sudo zypper install opera-stable_53.0.2907.68_amd64.rpm 
Loading repository data...
Reading installed packages...
Resolving package dependencies...

The following 4 NEW packages are going to be installed:
  at libfl2 libHX28 opera-stable

4 new packages to install.
Overall download size: 50.3 MiB. Already cached: 0 B. After the operation, additional 176.9 MiB will be used.
Continue? [y/n/...? shows all options] (y): n

Then I run this command to install dependencies:

> sudo zypper in at
Loading repository data...
Reading installed packages...
Resolving package dependencies...

The following 3 NEW packages are going to be installed:
  at libfl2 libHX28

3 new packages to install.
Overall download size: 208.6 KiB. Already cached: 0 B. After the operation, additional 600.4 KiB will be used.
Continue? [y/n/...? shows all options] (y): y

Then I run this to install the rpm file:

> sudo rpm -i opera-stable_53.0.2907.68_amd64.rpm

I'm not sure if it is the best practice, however it solved my issue.