Public bug reported:
When attempting a cmake build with the default apt installed `libceres-
dev` I encountered the following error:
```
CMake Error at /usr/lib/cmake/ceres/CeresConfig.cmake:89 (else):
Flow control statements are not properly nested.
Call Stack (most recent call first):
CMakeLists.txt:26 (find_package)
```
Digging into `/usr/lib/cmake/ceres/CeresConfig.cmake:89`, it looks like
line 87 should be `elseif`, not `else`. Manually editing the file and
rebuilding fixes my build.
```
85 if (Ceres_FIND_QUIETLY)
86 message(STATUS "Failed to find Ceres - " ${REASON_MSG} ${ARGN})
87 else (Ceres_FIND_REQUIRED)
88 message(FATAL_ERROR "Failed to find Ceres - " ${REASON_MSG} ${ARGN})
89 else()
```
I'm not sure how this got mangled as the source code version seems to be right
(see link). We've also been using this package / installation method for quite
a while without any issues, so I believe this is a new problem (as of 03/23).
https://github.com/ceres-solver/ceres-solver/blob/master/cmake/CeresConfig.cmake.in
Other information:
# lsb_release -rd
Description: Ubuntu 16.04.7 LTS
Release: 16.04
# apt-cache policy libceres-dev
libceres-dev:
Installed: 1.12.0+dfsg0-5
Candidate: 1.12.0+dfsg0-5
Version table:
*** 1.12.0+dfsg0-5 100
100 /var/lib/dpkg/status
** Affects: ceres-solver (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1921113
Title:
Invalid CMake Syntax
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