sci-physics/mbdyn: fix bullet detection

Signed-off-by: Alessandro Barbieri <lssndrbarbieri@gmail.com>

sci-physics/mbdyn/files/mbdyn-find-bullet.patch

@@ -0,0 +1,22 @@
+--- a/configure.ac
++++ b/configure.ac
+@@ -1889,15 +1889,15 @@
+ if test "$ol_with_bullet" != "no" ; then
+ 	AC_LANG_CPLUSPLUS
+ 	have_libbullet=no
+-	AC_CHECK_HEADER(BulletCollision/CollisionShapes/btCollisionShape.h,[have_bullet_h=yes],[have_bullet_h=no])
++	AC_CHECK_HEADER(bullet/BulletCollision/CollisionShapes/btCollisionShape.h,[have_bullet_h=yes],[have_bullet_h=no])
+ 	if test "$have_bullet_h" = "yes" ; then
+ 		SAVE_LIBS="$LIBS"
+-		try_BULLET_LIBS="-lbulletcollision -lbulletmath"
++		try_BULLET_LIBS="-lBulletCollision"
+ 		LIBS="$try_BULLET_LIBS $LIBS"
+-		AC_CHECK_LIB(bulletcollision,btBulletCollisionProbe,[
++		AC_CHECK_LIB(BulletCollision,btBulletCollisionProbe,[
+ 			have_libbullet=yes
+ 			BULLET_LIBS="$try_BULLET_LIBS"
+-		],[have_libbullet=no],[-lbulletmath])
++		],[have_libbullet=no],[])
+ 		LIBS="$save_LIBS"
+ 	fi
+ 

sci-physics/mbdyn/mbdyn-1.7.3_p20210925.ebuild

@@ -7,7 +7,7 @@ COMMIT="ae57618c4e7b030b59707b8c156a6e2a94a6efd0"
 MYP="${PN}-${COMMIT}"
 PYTHON_COMPAT=( python3_{8..10} )
 
-inherit autotools fortran-2 pam python-single-r1
+inherit autotools flag-o-matic fortran-2 pam python-single-r1
 
 DESCRIPTION="A general purpose Multibody Dynamics analysis software"
 HOMEPAGE="https://www.mbdyn.org"
@@ -138,6 +138,7 @@ DEPEND="
 BDEPEND="python? ( dev-lang/swig )"
 
 PATCHES=(
+	"${FILESDIR}/${PN}-find-bullet.patch"
 	"${FILESDIR}/${PN}-octave-no-global-install.patch"
 )
 #	"${FILESDIR}/${PN}-respect-libtool.patch"
@@ -176,7 +177,7 @@ src_prepare() {
 
 src_configure() {
 	python_setup
-#	append-cxxflags "-I/usr/include/openmpi/ompi/mpi/cxx/"
+	append-cxxflags "-I/usr/include/bullet"
 	local myconf=(
 		--disable-static
 		--disable-Werror